Add the Tune Advisor page to the Ethos suite docs

[robthomson]

The Ethos suite's Tune Advisor was one line in the Flight Tuning row of Using RFSuite. It now has its own page, Radio → Ethos → Tune Advisor (docs/radio/ethos/tune-advisor.md), which covers:

• Collecting data: which flight counts and how much each figure needs.
• How flights are saved and combined:
  • One flight is saved per disarm, and the FC is then cleared.
  • Only the last 5 flights are kept.
  • Only flights on the newest tune are combined (P, F, B, Iterm Relax Cutoff, rate type, rates), with counts added and measurements weighted by how much data they came from.
  • A disarm during a link loss is saved on reconnect.
• What it suggests: the rules and thresholds, and why Actual/Quick/Rotorflight rates get exact values while Betaflight/Raceflight/KISS get a percentage.
• Applying the changes:
  • Save, one axis at a time.
  • What Save checks before it writes, the five stages, and each message it can show.
  • Why a percentage rate change, and the F change that goes with it, are not written.
  • Why the saved flights are not purged afterwards, and changes.csv.
• Adjustment functions:
  • A mid-flight adjustment mixes two tunes.
  • Stepped adjustments and Mapped profile switches between flights are fine.
  • A Mapped gain adjustment overrides an applied value when its knob moves and at power-up.

Using RFSuite now links to the page, and the page is in the nav. It has two new X20 screenshots from the simulator.

Depends on rotorflight/rotorflight-lua-ethos-suite#2525, which adds Save to the Tune Advisor. Merge this after it.

mkdocs build passes with no warnings.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Documentation
  • Added a guide explaining how Tune Advisor collects flight data, provides tuning advice, applies changes, and manages tuning history.
  • Updated the Flight Tuning description to link to the guide and clarify that tuning hints can be written to the flight controller.
  • Added Tune Advisor to the FrSky Ethos documentation navigation.

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