[Edit docs] add mock-miner documentation

[friedger]

URL of the page to change: https://docs.stacks.co/docs/nodes-and-miners/stacks-node-configuration#configuration-file-options

The readme of the stacks-blockchain repo contains mock_miner: https://github.com/stacks-network/stacks-blockchain/blob/de541f9fc9bba0f2eccc647e729cfb5402476a38/README.md#mining

# Run as a mock-miner, to test mining without spending BTC.
# Mutually exclusive with `miner`.
#mock_miner = true

The documentation should answer

• when to use mock mining (gather data about miners like app.onstacks.com
• when to not use mock mining (as a real miner)
• what the impact is when using mock miner (more storage)
• whether it works or not when already running just a normal node, when connecting to the hiro bitcoin node, ..

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[friedger]

This can also help for testing Stacks 2.1

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[friedger]

It is still important to me