Add documentation to configurable sauna types to Saunum integration #42050

[mettolen]

Proposed change

The Saunum Leil control unit supports three sauna type presets that can store different configurations for temperature, sauna duration, and fan duration. These presets allow you start your sauna session with different settings quickly.
Preset settings and names can only be configured on the device, but preset names are not exposed via ModBus. This feature adds sauna preset types to climate entity and makes names configurable from integration settings so users can keep names in sync with the device.

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 logos 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 configurable sauna types to Saunum integration core#157741
• 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.

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[c0ffeeca7]

Thank you, @mettolen 👍