fix: unify font-family with paragon component styles

[ihor-romaniuk]

Description

This pull request contains recommendations for fixing custom font-family and make it unified with all MFEs and Paragon components.
All MFEs must have the same default appearance and change them globally via brand-openedx component on demand.

Related Pull Requests

PR to the open-release/palm.master branch: #596
PR to the master branch: #598

Screenshots/sandbox (optional):

Before	After

Merge Checklist

• If your update includes visual changes, have they been reviewed by a designer? Send them a link to the Sandbox, if applicable.
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Post-merge Checklist

• Deploy the changes to prod after verifying on stage or ask @openedx/edx-infinity to do it.
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6721225) 92.32% compared to head (922aab7) 92.32%.

Additional details and impacted files

@@                     Coverage Diff                     @@
##           open-release/quince.master     #597   +/-   ##
===========================================================
  Coverage                       92.32%   92.32%           
===========================================================
  Files                             169      169           
  Lines                            3451     3451           
  Branches                          899      899           
===========================================================
  Hits                             3186     3186           
  Misses                            244      244           
  Partials                           21       21           

Files	Coverage Δ
src/discussions/common/AuthorLabel.jsx	100.00% <ø> (ø)
src/discussions/common/EndorsedAlertBanner.jsx	100.00% <ø> (ø)

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[mphilbrick211]

Hi @openedx/edx-infinity! This is ready after the master is merged. Thanks!

[openedx-webhooks]

@ihor-romaniuk 🎉 Your pull request was merged! Please take a moment to answer a two question survey so we can improve your experience in the future.