fix(deps): update dependency vitepress to v1.0.0-alpha.29

Author: renovate[bot]

package.json

@@ -32,7 +32,7 @@
     "prismjs": "*",
     "shiki": "0.11.1",
     "vite": "3.2.3",
-    "vitepress": "1.0.0-alpha.28",
+    "vitepress": "1.0.0-alpha.29",
     "vue": "3.2.45"
   },
   "pnpm": {