Created a 'Deploy to GitHub Pages' GitHub Action

.github/workflows/deploy-gh-pages.yml

@@ -0,0 +1,20 @@
+name: Deploy to GitHub Pages
+
+on: workflow_dispatch
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Use Node.js ${{ matrix.node-version }}
+      uses: actions/setup-node@v2
+      with:
+        node-version: 16.x
+        cache: 'npm'
+    - run: npm ci
+    - run: npm run build
+    - run: npm test
+    - run: npm run cy:start-and-run
+    - run: npm run deploy