Add GitHub Pages deployment

Author: mb21

.github/workflows/deploy.yml

@@ -0,0 +1,34 @@
+name: Deploy to GitHub Pages
+
+on:
+  push:
+    branches: [ main ]
+
+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 your site
+        uses: withastro/action@v3
+        # with:
+          # path: . # The root location of your Astro project inside the repository. (optional)
+          # node-version: 20 # The specific version of Node that should be used to build your site. Defaults to 20. (optional)
+          # package-manager: pnpm@latest # The Node package manager that should be used to install dependencies and build your site. Automatically detected based on your lockfile. (optional)
+
+  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

@@ -14,6 +14,7 @@ export const guideChapters = [
 
 // https://astro.build/config
 export default defineConfig({
+	site: 'https://mastrojs.github.io',
 	integrations: [
 		starlight({
 			title: 'Mastro',