Add API for frameworks and examples (#3514)

* Add API for frameworks and examples

* Adjust headers

* Update frameworks list

* Always use latest

* Add types

* Use now repo for downloading and listing

* Use .existsSync

* Remove unused packages

* Use 307 for redirect

* Add examples

* Update tsconfig.json

Co-Authored-By: Steven <steven@ceriously.com>

* Make examples unique

* Remove detectors from frameworks API

* Use /api instead of Next.js

* Install dependencies

* Rename project

* Change name

* Empty

* Change name

* Update api/tsconfig.json

Co-Authored-By: Steven <steven@ceriously.com>

* Update examples

Co-authored-by: Steven <steven@ceriously.com>

api/_lib/util/with-api-handler.ts

@@ -0,0 +1,29 @@
+import { NowRequest, NowResponse } from '@now/node';
+
+type Handler = (req: NowRequest, res: NowResponse) => Promise<any>;
+
+export function withApiHandler(handler: Handler): Handler {
+  return async (req: NowRequest, res: NowResponse) => {
+    res.setHeader('Access-Control-Allow-Origin', '*');
+    res.setHeader('Access-Control-Allow-Methods', 'GET');
+    res.setHeader(
+      'Access-Control-Allow-Headers',
+      'Authorization, Accept, Content-Type'
+    );
+
+    if (req.method === 'OPTIONS') {
+      return res.status(200).json({});
+    }
+
+    if (req.method !== 'GET') {
+      return res.status(404).json({
+        error: {
+          code: 'not_found',
+          message: 'Only GET requests are supported for this endpoint.',
+        },
+      });
+    }
+
+    return handler(req, res);
+  };
+}