Modify search target in resource selector

[joepio]

When you want to search in a resource selector, we now always default to atomicdata.dev. There are several cases where you want to search your own server, instead. I think we need to provide some sort of UI for users to select a server. We could use the user's drives as the source for servers.

Or maybe we could use federated search, querying multiple drives at once, combining the results in one list. However, if we do that, we should also send a relevancy score.