MQTT Climate: Add documentation for receiving the current humidity

[Stonos]

Proposed change

This change introduces new variables to the MQTT Climate to control the humidity:

• current_humidity_template
• current_humidity_topic
• target_humidity_command_template:
• target_humidity_command_topic:
• target_humidity_state_topic:
• target_humidity_state_template:
  target_humidity_command_topic
• target_humidity_state_topic:
• target_humidity_state_template:

These allow you to control the climate humidity and let you set set the current humidity of the MQTT Climate, and work in a similar way to current_temperature_template and current_temperature_topic respectively.

Type of change

• Spelling, grammar or other readability improvements (current branch).
• Adjusted missing or incorrect information in the current documentation (current branch).
• Added documentation for a new integration I'm adding to Home Assistant (next branch).
  • I've opened up a PR to add logo's and icons in Brands repository.
• Added documentation for a new feature I'm adding to Home Assistant (next branch).
• Removed stale or deprecated documentation.

Additional information

• Link to parent pull request in the codebase: Add MQTT climate setting for current humidity core#84592
• Link to parent pull request in the Brands repository:
• This PR fixes or closes issue: fixes #

Checklist

• This PR uses the correct branch, based on one of the following:
  • I made a change to the existing documentation and used the current branch.
  • I made a change that is related to an upcoming version of Home Assistant and used the next branch.
• The documentation follows the Home Assistant documentation standards.

[jbouwh]

I am missing the humidity command, template and state topics an hum min max

[jbouwh]

Looks good,
Thnx @Stonos!