♿ Add an update notification popup

Appears when a new version of Typebot is available

Closes #312

apps/builder/src/pages/api/version.ts

@@ -0,0 +1,7 @@
+import { NextApiRequest, NextApiResponse } from 'next'
+
+const handler = async (_req: NextApiRequest, res: NextApiResponse) => {
+  return res.send({ commitSha: process.env.VERCEL_GIT_COMMIT_SHA })
+}
+
+export default handler