chore(docs): update TOC

Author: LargeModGames

README.md

@@ -31,7 +31,8 @@
 - [Privacy Notice](#privacy-notice)
 - [Migrating from spotify-tui](#migrating-from-spotify-tui)
 - [Installation](#installation)
-- [Connecting to Spotify](#connecting-to-spotify)
+- [First-time setup](#first-time-setup)
+  - [Adding Spotify later](#adding-spotify-later)
 - [Usage](#usage)
 - [Native Streaming](#native-streaming)
 - [Music Sources (Beyond Spotify)](#music-sources-beyond-spotify)