win: categorize, improve Xbox #279 #315 #479

This commit organizes Xbox scripts into a dedicated category,
simplifies naming, adds more documentation (and updating others' for
consistency), adds missing components and discourages removal of
breaking Xbox components.

This allows users to easily locate, find, apply and revert Xbox related
scripts.

Key changes:

- Move Xbox-related scripts into dedicated category for better
  organization and usability (see #315, #479)
- Add "Xbox Game Bar" app (`Microsoft.GamingApp` (see #279)
- Improve Xbox category documentation
- Flatten Xbox scripts for better maintainability and usability
- Remove Xbox components from strict recommendation pool
- Improve Xbox scripts documentation
- Order Xbox scripts for most common scenarios to least

Other changes:

- Improve documentation formatting and readability
- Add technical details sections for complex components
- Move preinstallation status into consistent header