docs: fix white labeling documentation link in readme

[paviad]

Proposed changes

Fix the README.md with the correct mobile app white labeling documentation link.

Issues

Closes #5795
https://rocketchat.atlassian.net/browse/COMM-109

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• Improvement (non-breaking change which improves a current function)
• New feature (non-breaking change which adds functionality)
• Documentation update (if none of the other choices apply)

Checklist

• I have read the CONTRIBUTING doc
• I have signed the CLA
• Lint and unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works (if applicable)
• I have added necessary documentation (if applicable)
• Any dependent changes have been merged and published in downstream modules

Summary by CodeRabbit

• Chores
  • Updated documentation link for mobile app white-labeling resources.

_{✏️ Tip: You can customize this high-level summary in your review settings.}

[coderabbitai]

Walkthrough

Updated a broken documentation link in README.md that was pointing to a 404 page. The link path for Mobile App White Labeling documentation was corrected from an outdated reference to the proper documentation path.

Changes

Cohort / File(s)	Summary
Documentation Link Fix README.md	Updated whitelabel documentation link from mobile-app-white-labelling to docs/mobile-app-white-labeling to resolve broken link (404) in the README's whitelabel section

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 A link was broken, leading nowhere fast,
Now the path corrected, the docs at last!
No 404 shadows on this sunny day,
White labeling wisdom points the right way! ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	The pull request successfully addresses issue #5795 by updating the broken white labeling documentation link from an incorrect path to the correct one (docs/mobile-app-white-labeling).
Out of Scope Changes check	✅ Passed	All changes are directly related to fixing the broken link issue; no out-of-scope modifications are present in this documentation-only update.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Title check	✅ Passed	The title clearly and accurately describes the main change: fixing a white labeling documentation link in the README, which aligns with the PR's core objective of correcting a broken link.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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