Add gitea webhook API

vercel.json

@@ -1,9 +1,26 @@
 {
   "version": 2,
+  "builds": [
+    {
+      "src": "package.json",
+      "use": "@vercel/static-build",
+      "config": {
+        "distDir": "build"
+      }
+    },
+    {
+      "src": "api/**/*.js",
+      "use": "@vercel/node"
+    }
+  ],
   "routes": [
     {
-      "src": "/api/gitea-webhook",
+      "src": "/api/(.*)",
-      "dest": "/api/gitea-webhook.js"
+      "dest": "/api/$1.js"
+    },
+    {
+      "src": "/(.*)",
+      "dest": "/"
     }
   ]
 }