Local development is hard when using KV

[kristianfreeman]

Currently, gatsby develop is fairly limited, because all the data for the application comes from KV. Running wrangler dev works, but you need to run gatsby build repeatedly as you're changing code. I'd like to set up either a live-reloading process, or have gatsby develop be able to:

1. recognize it's in a development mode
2. route requests to localhost:8787 (locally running instance of the Workers application)

A temporary solution to this has been taking the JSON blob from my wallets key and copying it into the components manually, in order to play with the data as it exists on the edge. This isn't a great solution (and I've accidentally committed it a few times, oops)