remove Android CI workflow and Dockerfile

APK build and deploy is now handled by a local post-commit hook
using scripts/android-build-deploy.sh + rsync.

.gitea/workflows/android.yml

@@ -1,34 +0,0 @@
-name: Android APK
-
-on:
-  push:
-    branches: [ master ]
-    paths:
-      - 'src-tauri/**'
-      - 'Dockerfile.android'
-      - '.gitea/workflows/android.yml'
-  workflow_dispatch:
-
-jobs:
-  build:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-
-      - name: Build APK in container
-        run: |
-          docker build -f Dockerfile.android -t bocken-android .
-          docker create --name apk-extract bocken-android
-          docker cp apk-extract:/tmp/Bocken.apk ./Bocken.apk
-          docker rm apk-extract
-
-      - name: Deploy APK to server
-        uses: appleboy/scp-action@master
-        with:
-          host: bocken.org
-          username: homepage
-          key: ${{ secrets.homepage_ssh }}
-          passphrase: ${{ secrets.homepage_pass }}
-          port: 22
-          source: "Bocken.apk"
-          target: "/var/www/static/"