Remove "Customize Colors" link for classic themes

[donnapep]

Proposed Changes

Remove Customize Colors link from Appearance settings for classic themes. This takes the user to the Customizer, but it doesn't really work. They can use the site editor to adjust colors instead.

Also updated https://senseilms.com/documentation/customizing-learning-mode-colors/ to remove references to the Customizer.

Testing Instructions

1. Activate a classic theme.
2. Go to Sensei LMS > Settings > Appearance.
3. Ensure there is no Customize Colors link.

Pre-Merge Checklist

• PR title and description contain sufficient detail and accurately describe the changes
• Acceptance criteria is met
• Decisions are publicly documented
• Adheres to coding standards (PHP, JavaScript, CSS, HTML)
• All strings are translatable (without concatenation, handles plurals)
• Follows our naming conventions (P6rkRX-4oA-p2)
• Hooks (p6rkRX-1uS-p2) and functions are documented
• New UIs are responsive and use a mobile-first approach
• New UIs match the designs
• Different user privileges (admin, teacher, subscriber) are tested as appropriate
• Legacy courses (course without blocks) are tested
• Code is tested on the minimum supported PHP and WordPress versions
• User interface changes have been tested on the latest versions of Chrome, Firefox and Safari
• "Needs Documentation" label is added if this change requires updates to documentation
• Known issues are created as new GitHub issues

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (884ae10) 51.45% compared to head (8db1ea9) 51.50%.
Report is 2 commits behind head on trunk.

Additional details and impacted files

@@             Coverage Diff              @@
##              trunk    #7491      +/-   ##
============================================
+ Coverage     51.45%   51.50%   +0.05%     
- Complexity    11203    11231      +28     
============================================
  Files           622      622              
  Lines         47408    47502      +94     
  Branches        414      414              
============================================
+ Hits          24394    24468      +74     
- Misses        22681    22701      +20     
  Partials        333      333              

Files	Coverage Δ
includes/class-sensei-settings.php	60.88% <ø> (+0.61%)	⬆️

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[Imran92]

The link's gone as expected 👍