chore(docs): add homepage for docs

docs/index.md

@@ -0,0 +1,15 @@
+## Spotizerr Documentation
+
+Start with Getting started, then explore the sections below.
+
+- [Getting started](user/getting-started.md)
+- [Configuration](user/configuration.md)
+- [Tracks](user/tracks.md)
+- [Albums](user/albums.md)
+- [Playlists](user/playlists.md)
+- [Artists](user/artists.md)
+- [Watchlist](user/watchlist.md)
+- [History](user/history.md)
+- [Multi-user](user/multi-user.md)
+
+For API details, see [API](API_DOCUMENTATION.md).

mkdocs.yml

@@ -11,6 +11,7 @@ theme:
     - search.suggest
     - search.highlight
 nav:
+  - Home: docs/index.md
   - Getting started: docs/user/getting-started.md
   - Configuration: docs/user/configuration.md
   - Tracks: docs/user/tracks.md