Improve documentation - HA

[f-gdovin]

I tired to set up HA to point to local stack for hours and I believe docs can be improved.

Something along the lines:

1. there is no "Reconfigure" button on Roborock integration UNTIL you successfully change it to your local server, so don't bother with that
2. add & configure Roborock integration against cloud
3. disable Roborock integration
4. turn off your HA
5. call https://{stack_fqdn}:555/api/v1/loginWithCode?email={protocol_email}&code={protocol_PIN} and save the response
6. edit {HA_dir}/config/.storage/core.config_entries and replace what you can with what you received in the previous step (for this to take effect, HA must be turned off)
7. turn on your HA
8. enable Roborock integration
9. you should be able to "Reconfigure" it now, it will ask for validation code which is {protocol_PIN}
10. done