refactor: search boost and pitch trim results

[Valastiri]

Summary

Includes fixes to boost finding "Pitch Trim" in search results on the beginners guide.

Future Boosting Control: After this PR we should opt to establish a boosting criteria for relevant pages if we need.

Currently it is set as the following to tweak results:

• boost: 2 (this is to bump desired result to the top)
• boost: 1 (demote other results)
• boost: 0.5 (further demote - see note below)

Header classification plays a a factor in natural boosting of results i.e. if an h1 contains trim it will most likely appear ahead of other searchs that are plain body or as a sub-heading.

TO DO

• [ ] Add additional information to Pitch Trim (request from Dev's)
• [ ] Check if applicable to other pitch trim related pages that are not beginners guide

Location

• docs/pilots-corner/beginner-guide/engine-start-taxi.md
• docs/pilots-corner/a32nx-briefing/flight-deck/pedestal/rudder-trim.md
• docs/pilots-corner/a32nx-briefing/flight-deck/pedestal/thrust-pitch-trim.md

Discord username (if different from GitHub): valastiri