integrations: hardware: revise to focus on BlueOS #25
Description
Hardware docs are currently ArduSub-focused, and likely somewhat outdated (e.g. see #24).
We should review their current state, and where relevant
- Make changes to focus the content on BlueOS integrations / compatibility
- Move ArduSub-specific information to the ArduSub docs (once we've set up a suitable place for that in the ArduPilot docs)