Simplify known instance selection on entry to the app.

[newtewt]

Currently our app shows Custom Alpha Dev and Beta Dev. It would be nice if we were to make a service call and get a list of known instances. Populate a list with the known instances and allow a user to just tap. While also keeping the custom in case the list doesn't get updated.

First Iteration thought would be a static file stored somewhere. Github for example that has a json file of names(key) with urls(value).

A super awesome would be somehow getting a list of all instances dynamically but may be a lot of overhead work.