chore: deploy docs to GitHub Pages via Actions

为 GitHub Pages 子路径 /Mp2RSS/ 适配 base 与 head 图标链接，
并新增 deploy.yml，在 push 到 main 时用 pnpm 构建后自动发布。

Author: areyoubugcoder

.github/workflows/deploy.yml

@@ -0,0 +1,58 @@
+name: Deploy VitePress site to GitHub Pages
+
+on:
+  push:
+    branches: [main]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: pages
+  cancel-in-progress: false
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: pnpm
+
+      - name: Install dependencies
+        run: pnpm install --frozen-lockfile
+
+      - name: Build with VitePress
+        run: pnpm build
+
+      - name: Setup Pages
+        uses: actions/configure-pages@v5
+
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: .vitepress/dist
+
+  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

.vitepress/config.mts

@@ -1,5 +1,6 @@
 import { defineConfig } from "vitepress";
 
+const base = "/Mp2RSS/";
 const GOOGLE_ANALYTICS_ID = process.env.GOOGLE_ANALYTICS_ID || "";
 const gaHead = GOOGLE_ANALYTICS_ID
   ? ([
@@ -28,11 +29,11 @@ export default defineConfig({
   srcDir: "docs",
   title: "Mp2RSS",
   description: "让订阅微信公众号像订阅播客一样顺畅",
-  base: "/",
+  base,
   lastUpdated: true,
   head: [
-    ["link", { rel: "icon", href: "/favicon.ico" }],
-    ["link", { rel: "apple-touch-icon", href: "/apple-touch-icon.png" }],
+    ["link", { rel: "icon", href: `${base}favicon.ico` }],
+    ["link", { rel: "apple-touch-icon", href: `${base}apple-touch-icon.png` }],
     ...gaHead,
   ],
   themeConfig: {