Added build & deploy workflow.

Author: gsaini

.github/workflows/main.yml

@@ -0,0 +1,25 @@
+name: GitHub Pages
+
+on:
+  push:
+    branches:
+      - source
+
+jobs:
+  build-deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Node.js
+        uses: actions/setup-node@v1
+        with:
+          node-version: '18.x'
+      - name: Install dependencies
+        run: yarn install
+      - name: Build the website
+        run: yarn build
+      - name: Deploy to GitHub Pages
+        uses: peaceiris/actions-gh-pages@v3
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: ./build