chore: add GitHub Pages deploy workflow and set site URL

Author: Kingpython123

.github/workflows/deploy.yml

@@ -0,0 +1,34 @@
+name: Deploy to GitHub Pages
+
+on:
+  # 每次 push 到 main 分支时触发
+  push:
+    branches: [main]
+  # 允许在 GitHub 的 Actions 页面手动触发
+  workflow_dispatch:
+
+# 允许该 job 克隆仓库并创建 Pages 部署
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout your repository using git
+        uses: actions/checkout@v7
+      - name: Install, build, and upload your site
+        uses: withastro/action@v6
+
+  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@v5

astro.config.mjs

@@ -6,7 +6,8 @@ import { defineConfig, fontProviders } from 'astro/config';
 
 // https://astro.build/config
 export default defineConfig({
-	site: 'https://example.com',
+	// 仓库名匹配 <username>.github.io，因此不需要配置 base
+	site: 'https://kingpython123.github.io',
 	integrations: [mdx(), sitemap()],
 	fonts: [
 		{