Update issue template and link to web app issue tracker

.github/ISSUE_TEMPLATE/bug.yml

@@ -6,7 +6,7 @@ labels:
 body:
   - type: markdown
     attributes:
-      value: Thanks for reporting a bug on the Typst compiler. Did you [take a look](https://github.com/typst/typst/issues?q=is%3Aopen+is%3Aissue+label%3Abug+-label%3A%22web+app%22) if your issue has already been filed? If so, join the discussion there!
+      value: Thanks for reporting a bug on the Typst compiler. Did you [take a look](https://github.com/typst/typst/issues?q=is%3Aopen+is%3Aissue+label%3Abug+-label%3A%22web+app%22) if your issue has already been filed? If so, join the discussion there! Is your issue related to Typst's web app? Please file it [here](https://github.com/typst/webapp-issues/issues) instead.
   - type: textarea
     id: description
     attributes:

.github/ISSUE_TEMPLATE/config.yml

@@ -1,8 +1,11 @@
 blank_issues_enabled: true
 contact_links:
+  - name: 💻 Web App Issues
+    url: https://github.com/typst/webapp-issues/issues
+    about: Bug reports or feature requests for Typst's official web app
   - name: 💬 Typst Discord
     url: https://discord.gg/2uDybryKPe
-    about: Get answers to your questions about Typst on our Discord server
+    about: Get answers to your questions about Typst on our Discord server.
   - name: 🗣️ Discussions on GitHub
     url: https://github.com/typst/typst/discussions
     about: Do you have a question instead of a specific bug or feature request? Open a discussion thread!

.github/ISSUE_TEMPLATE/feature.yml

@@ -6,7 +6,7 @@ labels:
 body:
   - type: markdown
     attributes:
-      value: Thanks for sharing your feature request for the Typst compiler. Did you [take a look](https://github.com/typst/typst/issues?q=is%3Aopen+is%3Aissue+label%3A%22feature+request%22+-label%3A%22web+app%22+) if a similar request has already been filed? If so, join the discussion there!
+      value: Thanks for sharing your feature request for the Typst compiler. Did you [take a look](https://github.com/typst/typst/issues?q=is%3Aopen+is%3Aissue+label%3A%22feature+request%22+-label%3A%22web+app%22+) if a similar request has already been filed? If so, join the discussion there! Is your feature request related to Typst's web app? Please file it [here](https://github.com/typst/webapp-issues/issues) instead.
   - type: textarea
     id: description
     attributes:

.github/ISSUE_TEMPLATE/web-app-bug-report.yml

@@ -1,56 +0,0 @@
-name: 💻 Web App Bug Report
-description: For issues specific to https://typst.app
-title: Write a short and descriptive title!
-labels:
-  - bug
-  - web app
-assignees:
-  - reknih
-body:
-  - type: markdown
-    attributes:
-      value: Thanks for reporting a bug on the Typst web app. Did you [take a look](https://github.com/typst/typst/issues?q=is%3Aopen+is%3Aissue+label%3A%22web+app%22+label%3Abug) if your issue has already been filed? If so, join the discussion there!
-  - type: textarea
-    id: description
-    attributes:
-      label: Description
-      description: Please describe your issue. Include specific steps to reproduce it or a screenshot if the problem is visual.
-      placeholder: Terse and specific description of the bug. You can add a screenshot by dragging an image here.
-    validations:
-      required: true
-  - type: input
-    id: repro-url
-    attributes:
-      label: Reproduction URL
-      description: If your issue involves a project and you did not specify Typst code above, you can share a link to your project here
-      placeholder: https://typst.app/project/rU6j4Q5foiCcvB7Hz_gs9m
-    validations:
-      required: false
-  - type: dropdown
-    id: browsers
-    attributes:
-      label: "Browsers"
-      description: What browsers are you seeing the problem on?
-      multiple: true
-      options:
-        - Firefox
-        - Chrome
-        - Safari
-        - Microsoft Edge
-        - Opera
-    validations:
-      required: false
-  - type: dropdown
-    id: os
-    attributes:
-      label: "OS"
-      description: Which operating system did you use?
-      multiple: true
-      options:
-        - Windows
-        - Linux
-        - macOS
-        - Android
-        - iOS or iPad OS
-    validations:
-      required: false

.github/ISSUE_TEMPLATE/web-app-feature-request.yml

@@ -1,28 +0,0 @@
-name: 🎁 Web App Feature Request
-description: For feature requests specific to https://typst.app
-title: Write a short and descriptive title!
-labels:
-  - feature request
-  - web app
-assignees:
-  - reknih
-body:
-  - type: markdown
-    attributes:
-      value: Thanks for sharing your feature request for the Typst web app. Did you [take a look](https://github.com/typst/typst/issues?q=is%3Aopen+is%3Aissue+label%3Abug+label%3A%22feature+request%22) if a similar request has already been filed? If so, join the discussion there!
-  - type: textarea
-    id: description
-    attributes:
-      label: Description
-      description: Please describe your feature request. You can also add a mockup!
-      placeholder: Terse and specific description of the feature. You can add an image by dragging a file here.
-    validations:
-      required: true
-  - type: textarea
-    id: use-case
-    attributes:
-      label: Use Case
-      description: Please describe why this feature would be useful.
-      placeholder: Describe what users can accomplish with this feature and whom it might be useful for.
-    validations:
-      required: true