Update spotbit api url and path

[BBlackwo]

Closes #2381

Fixed

• The onion service url and API path was updated as per Server is down BlockchainCommons/spotbit#103 and https://spotbit.info/docs

Outstanding issues

Some outstanding issues (not sure if I'll have time to fix them all though):

• Not sure why the test is failing as it seems like it's supposed to be ignoring spotbit entirely...
• The default spotbit configuration now supports mostly different exchanges than what Specter is expecting (see https://github.com/BlockchainCommons/spotbit/blob/master/spotbit.config). It seems Specter should maybe run its own Spotbit server to be able to customise this?
• The historical API has changed to use start and end query parameter date time strings instead of path parameters

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[k9ert]

Tests are now green. But that was only something formal as this is not covered by tests.
Running our own spotbit-server is not really an option. I guess we should rather adjust to what spotbit is providing. In
685f041 i've removed the invalid ones and added gemini for now. I tried Binance as well but that didn't work out as usd is not supported for binance on spotbit and the other currencies had no data.
Haven't tried the other ones.

[k9ert]

I've also looked at the history API and hopefully have fixed it. Can you test that? Thanks for your work :-) .

[BBlackwo]

Spotbit is down at the moment so might be difficult to test 😅 BlockchainCommons/spotbit#105

[k9ert]

Ok, let's assume the best. As i'm doing a release soon and it's couldn't get worse than "not working", i'm merging this right now.

[BBlackwo]

Ok great thanks for finishing the PR off! 🙂