add GH Pages deploy to workflow

.github/workflows/main.yml

@@ -27,7 +27,9 @@ jobs:
       run: npm install
     - name: Test
       run: npm run test
-    - name: Deploy
+
+    - name: GH Pages deploy
+      uses: Cecilapp/GitHub-Pages-deploy@2.0.1
       run: npm run deploy
       env:
         GITHUB_TOKEN: ${{ secrets.GITHUB_EPG_BOT_TOKEN }}