Add MikroTik BT5 integration documentation

[Anrijs]

Proposed change

Adds documentation for the MikroTik BT5 integration

Type of change

• [ ] Spelling, grammar or other readability improvements (current branch).
• [ ] Adjusted missing or incorrect information in the current documentation (current branch).
• [x] Added documentation for a new integration I'm adding to Home Assistant (next branch).
  • [x] 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: https://github.com/home-assistant/core/pull/117354
• Link to parent pull request in the Brands repository: https://github.com/home-assistant/brands/pull/5456
• This PR fixes or closes issue: fixes #

Checklist

• [x] 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.
• [x] The documentation follows the Home Assistant documentation standards.

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[frenck]

Closing PR as the parent PR has been closed.