[sBTC DR] Add get-started document for sBTC DR

[friedger]

This PR

• removes references to sbtc mini
• adds a get started page for sBTC DR 0.1 (romeo)

See #77

[friedger]

I have added more details about the configuration.

We might need to change this again when we do not use clarinet integrate but something else https://github.com/stacks-network/sbtc/issues/85