Use auto-generated config documentation

CONFIG.md

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+# Configuration options
+
+Cove's config file uses the [TOML](https://toml.io/) format.
+
+## `data_dir`
+
+**Required:** no  
+**Type:** path  
+**Default:** platform-dependent
+
+The directory that cove stores its data in when not running in ephemeral
+mode.
+
+Relative paths are interpreted relative to the user's home directory.
+
+See also the `--data-dir` command line option.
+
+## `ephemeral`
+
+**Required:** yes  
+**Type:** boolean  
+**Default:** `false`
+
+Whether to start in ephemeral mode.
+
+In ephemeral mode, cove doesn't store any data. It completely ignores
+any options related to the data dir.
+
+See also the `--ephemeral` command line option.
+
+## `euph.rooms.<room>.autojoin`
+
+**Required:** yes  
+**Type:** boolean  
+**Default:** `false`
+
+Whether to automatically join this room on startup.
+
+## `euph.rooms.<room>.force_username`
+
+**Required:** yes  
+**Type:** boolean  
+**Default:** `false`
+
+If `euph.rooms.<room>.username` is set, this will force cove to set the
+username even if there is already a different username associated with
+the current session.
+
+## `euph.rooms.<room>.password`
+
+**Required:** no  
+**Type:** string
+
+If set, cove will try once to use this password to authenticate, should
+the room be password-protected.
+
+## `euph.rooms.<room>.username`
+
+**Required:** no  
+**Type:** string
+
+If set, cove will set this username upon joining if there is no username
+associated with the current session.
+
+## `offline`
+
+**Required:** yes  
+**Type:** boolean  
+**Default:** `false`
+
+Whether to start in offline mode.
+
+In offline mode, cove won't automatically join rooms marked via the
+`autojoin` option on startup. You can still join those rooms manually by
+pressing `a` in the rooms list.
+
+See also the `--offline` command line option.
+
+## `rooms_sort_order`
+
+**Required:** yes  
+**Type:** string  
+**Values:** `alphabet`, `importance`  
+**Default:** `alphabet`
+
+Initial sort order of rooms list.
+
+`alphabet` sorts rooms in alphabetic order.
+
+`importance` sorts rooms by the following criteria (in descending order
+of priority):
+
+1. connected rooms before unconnected rooms
+2. rooms with unread messages before rooms without
+3. alphabetic order