chore: improve guide

[RafilxTenfen]

Modifications for improvements on the guide

• Add a reminder for json registry information in PR to be exactly the same as the one used to sign, not just the content
• Update BTC staker to not use the example btc-pk in command, use <staker_pk> instead
• Add an explicit section to discuss deposit amounts and amounts lower than 0.1sBTC will be considered invalid registration
• Script to validate new finality provider information locally (runs the same checks as the CI will do on the PR)
• Section to verify the signed staking transaction before sending to BTC
• Add validation of commission 0.[0-9]+

[vitsalis]

Nice!

[RafilxTenfen]

CI tested at https://app.circleci.com/pipelines/github/babylonchain/networks/461/workflows/85f8d04d-c569-474a-ad38-2585db36e940/jobs/2309

[vitsalis]

lgtm, some minor comments

[vitsalis]

Where does the fpChanged variable become set?

[RafilxTenfen]

it is a function we are calling loaded from . $CWD/fp-changed.sh

[RafilxTenfen]

networks/bbn-test-4/finality-providers/scripts/fp-changed.sh

Lines 7 to 8 in da77ed6

	function fpChanged {