fix: scrobble selector attribute name + update element index

src/common/facets/foundation.js

···
   const sao = new ScrobbleAudioOrchestrator();
   sao.setAttribute("group", GROUP);
   sao.setAttribute("audio-engine-selector", a.selector);
-  sao.setAttribute("scrobbles-selector", sc.selector);
+  sao.setAttribute("scrobble-selector", sc.selector);
 
   return findExistingOrAdd(sao);
 }

src/components/orchestrator/scrobble-audio/element.js

···
     this.audio = query(this, "audio-engine-selector");
 
     /** @type {ScrobbleElement} */
-    this.scrobbles = query(this, "scrobbles-selector");
+    this.scrobble = query(this, "scrobble-selector");
 
     await customElements.whenDefined(this.audio.localName);
-    await customElements.whenDefined(this.scrobbles.localName);
+    await customElements.whenDefined(this.scrobble.localName);
 
     this.effect(() => this.#monitorAudio());
   }
···
     if (this.#trackId !== id || !this.#activeTrack) return;
 
     try {
-      await this.scrobbles?.nowPlaying(this.#activeTrack);
+      await this.scrobble?.nowPlaying(this.#activeTrack);
     } catch (err) {
       console.warn("scrobble: nowPlaying failed", err);
     }
···
     const startedAt = this.#startedAt;
 
     try {
-      await this.scrobbles?.scrobble(track, startedAt);
+      await this.scrobble?.scrobble(track, startedAt);
     } catch (err) {
       console.warn("scrobble: scrobble failed", err);
       this.#scrobbled = false;

src/index.vto

···
   - url: "components/configurator/scrobbles/element.js"
     title: "Scrobbles"
     desc: "Configure multiple scrobblers (music trackers)."
-    todo: true
 
 engines:
   - url: "components/engine/audio/element.js"
···
   - url: "components/orchestrator/queue-audio/element.js"
     title: "Queue ⭤ Audio"
     desc: "Connects the given queue engine to the given audio engine."
+  - url: "components/orchestrator/scrobble-audio/element.js"
+    title: "Scrobble ⭤ Audio"
+    desc: "Connects the audio engine with a scrobbler element. Calls `nowPlaying` when a track starts playing and `scrobble` once the user has listened long enough."
   - url: "components/orchestrator/sources/element.js"
     title: "Sources"
     desc: "Monitor tracks from the given output to form a list of sources based on the input's sources return value."
···
     desc: "Provides a way to search through a collection of tracks, powered by orama.js"
 
 supplements:
-  - title: "Last.fm Scrobbler"
-    todo: true
+  - url: "components/supplement/last.fm/element.js"
+    title: "Last.fm Scrobbler"
   - title: "ListenBrainz Scrobbler"
     todo: true
   - title: "Rocksky Scrobbler"