[Docs] Update 'Using Teleport Connect' for Linux & Windows (#16770)

* pre-update edits

* update for multiple OSes

Also adjusted line breaks assuming a 100char cutoff.

* add insecure flag for Windows

* Apply suggestions from code review

Co-authored-by: Rafał Cieślak <rafal.cieslak@goteleport.com>

* Update docs/pages/connect-your-client/teleport-connect.mdx

* Update docs/pages/connect-your-client/teleport-connect.mdx

Co-authored-by: Rafał Cieślak <rafal.cieslak@goteleport.com>

* Apply suggestions from code review

Co-authored-by: Paul Gottschling <paul.gottschling@goteleport.com>

* don't use markdown's auto-iteration

Co-authored-by: Rafał Cieślak <rafal.cieslak@goteleport.com>
Co-authored-by: Paul Gottschling <paul.gottschling@goteleport.com>

docs/pages/connect-your-client/teleport-connect.mdx

@@ -11,10 +11,31 @@ other resources such as Kubernetes clusters and applications coming in the futur
 ## Installation & upgrade
 
 Head over to the [Downloads](https://goteleport.com/download/) page to download the most recent
-version of Teleport Connect. As of now, Teleport Connect supports macOS only. Double-click the
-downloaded `.dmg` file and drag the Teleport Connect icon to the Applications folder.
+version. Teleport Connect supports macOS, Linux, and Windows.
+
+<Tabs>
+<TabItem label="macOS">
+Double-click the downloaded `.dmg` file and drag the Teleport Connect icon to the Applications folder.
 
 To upgrade Teleport Connect to a newer version, drag the new version to the Applications folder.
+</TabItem>
+<TabItem label="Linux">
+Download the DEB (Debian-based distros) or RPM (RHEL-based distros) package and install it using
+your package manager. Repeat the process for in-place upgrades.
+
+You can also download the project as a `tar.gz` file to extract and run it in place:
+
+```code
+$ tar -xf  teleport-(=teleport.version=)-linux-*.tar.gz
+```
+</TabItem>
+<TabItem label="Windows">
+Download and run the installer `.exe` file. It will install and open Teleport Connect without
+further user input.
+
+Repeat the process with newer versions to upgrade.
+</TabItem>
+</Tabs>
 
 ## User interface
 
@@ -22,35 +43,34 @@ To upgrade Teleport Connect to a newer version, drag the new version to the Appl
 
 The top bar of Teleport Connect consists of:
 
-- The **profile selector** (the top right), which allows you to switch between profiles on different Teleport
-  clusters as well as log in or out of the clusters.
+- The **profile selector** (the top right), which allows you to switch between profiles on different
+  Teleport clusters as well as log in or out of the clusters.
 - The **connection list** (the top left) showing recent connections, allowing you to seamlessly switch
   between them.
 - The **command bar** (in the middle), which launches any command you input in a new terminal tab.
-- The **cluster selector** (to the left of the command bar), which shows up only if you have set up Trusted Clusters and there are leaf clusters
-  connected to the root cluster. It lets you browse leaf cluster resources. It also changes
-  which cluster the commands in the command bar are going to target.
+- The **cluster selector** (to the left of the command bar), which shows up only if you have set up
+  Trusted Clusters and there are leaf clusters connected to the root cluster. It lets you browse
+  leaf cluster resources. It also changes which cluster the commands in the command bar are going to target.
 
 ## Connecting to an SSH server
 
 1. Open a tab with cluster resources by clicking on the plus symbol at the right end of the tab bar.
-   You can also press `Cmd + T` to achieve the same result.
+  You can also press `Ctrl/Cmd + T` to achieve the same result.
 2. Look for the SSH server you want to connect to and click the Connect button to the right.
 3. Select or enter the SSH user you wish to log in as and press `Enter`.
 4. A new tab will open with a shell session on the chosen server.
 
-Alternatively, you can type `tsh ssh` into the command bar and the autocompletion will help you
-connect to a server.
+Alternatively, you can type `tsh ssh` into the command bar in the Teleport Connect window, and the autocompletion will help
+you connect to a server.
 
 ## Connecting to a database
 
 1. Open a tab with cluster resources by clicking on the plus symbol at the end of the tab bar. You
-   can also press `Cmd + T` to achieve the same result.
+  can also press `Ctrl/Cmd + T` to achieve the same result.
 2. Select the Databases section.
 3. Look for the database server you wish to connect to and click the Connect button to the right.
 4. Select or enter the database user you with to use and press `Enter`.
-5. A new tab will open with a new connection established between your device and the database
-   server.
+5. A new tab will open with a new connection established between your device and the database server.
 
 This connection will remain active until you click the Close Connection button or close Teleport
 Connect. The port number will persist between app restarts—you can set up your favorite client
@@ -64,8 +84,8 @@ Connect with GUI section.
 ### With a CLI client
 
 The database connection tab shows the command that can be used to connect to the database. You can
-modify the database name of the connection and then click the Run button to open a new
-terminal tab with that command executed.
+modify the database name of the connection and then click the Run button to open a new terminal tab
+with that command executed.
 
 ## Connecting to multiple clusters
 
@@ -74,7 +94,7 @@ your first cluster, open the profile selector at the top right and click the *+A
 button. You can switch between active profiles in multiple ways:
 
 - Click at the profile selector button at the top right.
-- Open the profile selector with a shortcut (`Cmd + I`).
+- Open the profile selector with a shortcut (`Ctrl/Cmd + I`).
 - Using the connection list at the top left to select a connection will automatically switch you to
   the right profile.
 
@@ -97,18 +117,45 @@ cluster. This can help if you encounter a bug which renders the user interface p
 It might also help if you have issues with connecting to an active cluster that don't happen in the
 Web UI.
 
+<Tabs>
+<TabItem label="macOS">
 To force the app to log you out of all clusters, close the app and remove the `~/Library/Application
-Support/Teleport Connect/tsh` folder. Removing the file under `~/Library/Application
+Support/Teleport Connect/tsh` folder. Removing the file `~/Library/Application
 Support/Teleport Connect/app_state.json` will clear all remembered tabs and connections.
+</TabItem>
+<TabItem label="Linux">
+To force the app to log you out of all clusters, close the app and remove the `~/.config/Teleport
+Connect/tsh` folder. Removing the file `/.config/Teleport Connect/app_state.json` will clear
+all remembered tabs and connections.
+</TabItem>
+<TabItem label="Windows">
+To force the app to log you out of all clusters, close the app and remove the
+`C:\Users\%UserName%\AppData\Roaming\Teleport Connect\tsh` folder. Removing the file
+`C:\Users\%UserName%\AppData\Roaming\Teleport Connect\app_state.json` will clear all remembered tabs
+and connections.
+</TabItem>
+</Tabs>
 
 ### Submitting an issue
 
 To submit an issue, click the Submit Feedback button at the bottom right (the speech bubble symbol)
 and follow the *Submit a Bug* link.
 
-Be sure to attach logs which can be found under `~/Library/Application Support/Teleport
-Connect/logs`. The version of the app can be found in the app menu under the About Teleport Connect
-menu item.
+<Tabs>
+<TabItem label="macOS">
+Be sure to attach logs, which can be found under `~/Library/Application Support/Teleport Connect/logs`.
+The version of the app can be found in the app menu under the About Teleport Connect menu item.
+</TabItem>
+<TabItem label="Linux">
+Be sure to attach logs, which can be found under `~/.config/Teleport Connect/logs`. The app version
+can be found by pressing `Alt` to access the app menu, then -> Help -> About Teleport Connect.
+</TabItem>
+<TabItem label="Windows">
+Be sure to attach logs, which can be found under `C:\Users\%UserName%\AppData\Roaming\Teleport Connect\logs`.
+You may need to adjust File Explorer to [view hidden files and folders](https://support.microsoft.com/en-us/search?query=how%20to%20view%20hidden%20files%20in%20windows%2010).
+The app version can be found by pressing `Alt` to access the app menu -> Help -> About Teleport Connect.
+</TabItem>
+</Tabs>
 
 ### Updating local shell environment
 
@@ -119,9 +166,11 @@ see them only after you restart the app.
 ### Insecure mode
 
 You can open Teleport Connect in insecure mode, which skips HTTPS certificate verification when
-talking to a Teleport Proxy Service. This is useful in test environments or for demo purposes. We do
-not recommend using this mode in production.
+talking to a Teleport Proxy Service. This is useful in test environments or for demo purposes. We
+do not recommend using this mode in production.
 
+<Tabs>
+<TabItem label="macOS">
 To launch the app in insecure mode, open a terminal first. From there you can launch the app in one
 of two ways:
 
@@ -132,3 +181,19 @@ $ open -a "Teleport Connect" --args --insecure
 # Passing the flag to the executable directly:
 $ /Applications/Teleport\ Connect.app/Contents/MacOS/Teleport\ Connect --insecure
 ```
+</TabItem>
+<TabItem label="Linux">
+From a terminal, open Teleport Connect with the `--insecure` flag:
+
+```code
+$ teleport-connect --insecure
+````
+</TabItem>
+<TabItem label="Windows">
+From the Command Prompt, open Teleport Connect with the `--insecure` flag:
+
+```code
+$ "%LocalAppData%\Programs\teleport-connect\Teleport Connect.exe" --insecure
+````
+</TabItem>
+</Tabs>