Use Real Cloud Functions Go Runtime, Not Fake One

[grant]

We use this module for Cloud Functions:
https://github.com/GoogleCloudPlatform/functions-framework-go

This repo looks old and should be deprecated. I found it out by accident.

@juliehockett do you have context for this repo?

[ssttevee]

This was a hacky way to use Go on GCF before it got official support.

@iangudger was the maintainer afaik.

It'd probably be a good idea to archive this repo since it's obsolete now.