chore: update secondary link style for one theme

[mxschll]

Description

Applies visual treatment of primary links to secondary links in one theme.

Related links, issue #, if available: n/a

How has this been tested?

Review checklist

The following items are to be evaluated by the author(s) and the reviewer(s).

Correctness

• Changes include appropriate documentation updates.
• Changes are backward-compatible if not indicated, see CONTRIBUTING.md.
• Changes do not include unsupported browser features, see CONTRIBUTING.md.
• Changes were manually tested for accessibility, see accessibility guidelines.

Security

• If the code handles URLs: all URLs are validated through the checkSafeUrl function.

Testing

• Changes are covered with new/existing unit tests?
• Changes are covered with new/existing integration tests?

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.66%. Comparing base (4705254) to head (e603865).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4900   +/-   ##
=======================================
  Coverage   97.66%   97.66%           
=======================================
  Files         958      958           
  Lines       31314    31314           
  Branches    11565    11564    -1     
=======================================
  Hits        30582    30582           
- Misses        686      725   +39     
+ Partials       46        7   -39     

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