[feat] check sanity of rpc node during minting phase

[Zir0h]

Describe the problem

I've seen some people struggle when minting with a bad rpc node. The screen usually just hangs on the final step. As a workaround we ask people to try minting again with the webdev console of their browser opened and check for error messages.

Describe the solution you'd like

Would it be possible to show the visitor if the rpc node is having issues? This could be a dns error, http error, node rejecting the transaction...

Alternatives considered

Would it be possible to do a call to the version endpoint of the rpc nodes, for example https://mainnet.api.tez.ie/version, and abort / redirect the visitor to the settings menu to select another node?

Additional context

No response

[Zir0h]

Worked around with #339