feat: show call participants in room list (Discord-style)

docs/e2ee.md

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+# End to end encryption by default
+
+By default, Element will create encrypted DM rooms if the user you are chatting with has keys uploaded on their account.
+For private room creation, Element will default to encryption on but give you the choice to opt-out.
+
+## Disabling encryption by default
+
+Set the following on your homeserver's
+`/.well-known/matrix/client` config:
+
+```json
+{
+    "io.element.e2ee": {
+        "default": false
+    }
+}
+```
+
+## Disabling encryption
+
+Set the following on your homeserver's
+`/.well-known/matrix/client` config:
+
+```json
+{
+    "io.element.e2ee": {
+        "force_disable": true
+    }
+}
+```
+
+When `force_disable` is true:
+
+- all rooms will be created with encryption disabled, and it will not be possible to enable
+  encryption from room settings.
+- any `io.element.e2ee.default` value will be disregarded.
+
+Note: If the server is configured to forcibly enable encryption for some or all rooms,
+this behaviour will be overridden.
+
+# Setting up recovery
+
+By default, Element strongly encourages (but does not require) users to set up
+recovery so that you can access history on your new devices as well as retain access to your message history and cryptographic identity when you lose all of your devices.
+
+## Removal of old settings
+
+Support for the configuration options `secure_backup_required` and `secure_backup_setup_methods`
+in the `/.well-known/matrix/client` config has been removed.
+
+Setting up recovery is now always recommended to all users by showing a one-off toast and a
+permanent red dot on the _Encryption_ tab in the _Settings_ dialog. When creating a new
+recovery key, the UI only supports auto-generated keys. Using an existing (custom) passphrase
+still works, but is not exposed in the UI when setting up recovery.
+
+# Compatibility
+
+The settings above were first proposed under a `im.vector.riot.e2ee` key, which
+is now deprecated. Element will check for either key, preferring
+`io.element.e2ee` if both exist.