* Improve typing of client CORS helper
* Take node-fetch as a dependency
* Add explicit Firebase region into config
* Add new Vercel proxy API routes that talk to backend
* Call Vercel proxy routes from `api-call` module
* Tweak import to try to get Vercel happy
* Tidy up a tiny bit
* Set up read API using Vercel serverless functions
Featuring:
/api/v0/markets
/api/v0/market/[contractId]
/api/v0/slug/[contractSlug]
* Include tags in API