ci: fix Android docs sync (remove stray workflow, prune stale pages) (#5955)

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

.github/workflows/sync-android-docs.yml

@@ -1,53 +0,0 @@
-name: Sync Android App Documentation
-
-on:
-  schedule:
-    - cron: "0 0 * * 0" # Every Sunday at midnight UTC
-  workflow_dispatch:
-
-jobs:
-  sync:
-    runs-on: ubuntu-24.04
-    permissions:
-      contents: write
-      pull-requests: write
-
-    steps:
-      - name: Checkout meshtastic/meshtastic
-        uses: actions/checkout@v7.0.0
-        with:
-          fetch-depth: 1
-
-      - name: Clone meshtastic/Meshtastic-Android
-        run: |
-          git clone --depth=1 --branch main https://github.com/meshtastic/Meshtastic-Android.git /tmp/Meshtastic-Android
-
-      - name: Setup Node.js
-        uses: actions/setup-node@v6
-        with:
-          node-version-file: ".nvmrc"
-
-      - name: Install cwebp
-        run: sudo apt-get update && sudo apt-get install -y webp
-
-      - name: Run sync script
-        run: node /tmp/Meshtastic-Android/scripts/sync-android-docs.js /tmp/Meshtastic-Android --convert-webp
-
-      - name: Create Pull Request
-        uses: peter-evans/create-pull-request@v8
-        with:
-          token: ${{ secrets.GITHUB_TOKEN }}
-          commit-message: "docs: sync latest Android app documentation"
-          branch: sync/android-docs
-          delete-branch: true
-          title: "docs: sync latest Android app documentation"
-          body: |
-            This PR was automatically created by the [sync-android-docs](../.github/workflows/sync-android-docs.yml) workflow.
-
-            It synchronizes Markdown documentation and images from [meshtastic/Meshtastic-Android](https://github.com/meshtastic/Meshtastic-Android) into this repository:
-
-            - Markdown files → `docs/software/android/`
-            - Image files → `static/img/android/docs/`
-
-            Image paths in Markdown are rewritten to use the Docusaurus `/img/android/docs/` static path.
-            Screenshots are converted to WebP for optimal site performance.