feat: add github action for deployment

.github/workflows/deploy.yml

@@ -0,0 +1,34 @@
+name: Deploy to GitHub Pages
+
+on:
+  push:
+    branches: [main]
+  # Allows running this workflow manually from the Actions tab on GitHub.
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout your repository using git
+        uses: actions/checkout@v4
+      - name: Install, build, and upload
+        uses: withastro/action@v3
+        node-version: 20
+        package-manager: pnpm@latest
+
+  deploy:
+    needs: build
+    runs-on: ubuntu-latest
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4

astro.config.mjs

@@ -6,6 +6,8 @@ import rehypeExternalLinks from "rehype-external-links";
 
 // https://astro.build/config
 export default defineConfig({
+  site: "https://nikitarevenco.github.io",
+  base: "/helix-golf",
   markdown: {
     rehypePlugins: [
       rehypeHeadingIds,