Add deployment workflow and privacy policy documentation

Author: konyshevgmbh

.github/workflows/deploy.yml

@@ -0,0 +1,30 @@
+name: Deploy Yell Lander Web to GitHub Pages
+
+on:
+  push:
+    branches: [ main ]   
+
+jobs:
+  build-and-deploy:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Set up Flutter
+        uses: subosito/flutter-action@v2
+        with:
+          flutter-version: '3.7.2'   
+
+      - name: Install dependencies
+        run: flutter pub get
+
+      - name: Build web
+        run: flutter build web
+
+      - name: Deploy to GitHub Pages
+        uses: peaceiris/actions-gh-pages@v3
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: build/web