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/examples/list-all.ts

@@ -0,0 +1,10 @@
+import { NowRequest, NowResponse } from '@now/node';
+import { getExampleList } from '../_lib/examples/example-list';
+import { withApiHandler } from '../_lib/util/with-api-handler';
+
+export default withApiHandler(async function(
+  req: NowRequest,
+  res: NowResponse
+) {
+  res.status(200).json(await getExampleList());
+});