📝 add documentation

docs/config folder.md

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+# Config Folder
+
+Everything should be configured through the mounted config folder.
+To enable certain features just put the right files in there.
+
+## General Config
+The main configuration is in `config.json`. See [this](./config.json.md)
+
+## Profile Picture
+If you want to show a picture on the main page, place a file called `me.avif` in the config folder.
+
+## PGP Key
+If you want to share your public key, put it inside `pub.key`.

docs/config.json.md

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+# config.json
+
+## Possible Values to configure:
+- `name` : Personal Name
+- `email` : Personal Mail
+- `secret_key` : Secret Key for Flask
+- `xmr_address` : Monero Receive Address