Allow adding to supported chains

[dirtycajunrice]

The current implementation does not allow configuring supported chains. Although wagmi allows it, and connectkit will connect to it, logos cant be set.

[lochie]

Hey @dirtycajunrice,

We do currently allow custom chains to be configured just like you would in wagmi (see docs), but indeed the chain logo we haven't made customisable yet, but we're looking to get this in within one of the next few updates!

[royalaid]

Just curious if this being worked out. If not it seems like the PR would be pretty simple and I might be able to take a stab