Adding Github action to deploy website

Author: moufmouf

.github/workflows/deploy-website.yml

@@ -0,0 +1,27 @@
+name: "Deploy website"
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  couscous:
+    name: "Deploy website with Couscous"
+    runs-on: "ubuntu-latest"
+
+    strategy:
+      matrix:
+        php-version:
+          - "7.4"
+
+    steps:
+      - name: "Checkout"
+        uses: "actions/checkout@v2"
+
+      - uses: CouscousPHP/GitHub-Action@v1
+      - name: Deploy
+        uses: peaceiris/actions-gh-pages@v3
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: ./.couscous/generated