Update footer links headers font-size

[ajinkabeer]

Fixes #9197

This PR fixes the issue #9197. Now all the footer links headers have the same font size.

Before:

After:

[codecov-io]

Codecov Report

Merging #9199 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #9199   +/-   ##
======================================
  Coverage    98.1%   98.1%           
======================================
  Files         272     272           
  Lines        7563    7563           
  Branches     1370    1370           
======================================
  Hits         7420    7420           
  Misses        129     129           
  Partials       14      14

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[muffinresearch]

r+, looks good. Thanks for the patch.

[ajinkabeer]

Thank you :)

[caitmuenster]

Thanks so much for the patch, @ajinkabeer! ⭐️ Your contribution has been added to our recognition wiki and your Mozillians profile has been vouched.

Welcome onboard! I look forward to seeing you around the project.

[ajinkabeer]

Wow, that is awesome. Thank you so much @caitmuenster