Help docs updates from Intercom ticket review (Sept 2025)

[thomaskimura]

This PR implements documentation improvements based on recent Intercom ticket insights:

1. Kaleidoscope Map Integration: Adds troubleshooting steps with a visual example.
2. Paper Theme: Clarifies collection sorting logic and admin steps.
3. License Transfer FAQ: Adds a dedicated license transfer and activation FAQ.
4. Space Theme: Clarifies use of H1, accessibility best practices, and alt text support.
5. Onboarding/Color Setup: Enhances onboarding and color setup guides for clarity, includes updated visuals.
6. Keystone Theme: Adds a migration and compatibility checklist for non-disruptive upgrades.

All language and visual guides are revised for clarity and direct actionability, directly reflecting user feedback from Intercom ticket reviews.

Referencing Intercom ticket summary for context and user-supplied pain points. Please review and suggest any further improvements for these docs.