fix: remove primary color from discussion post and messages text

[bydawen]

There is an issue where on discussion pages, comment text and username have text-primary-500 class which is usually used for links, buttons, etc. instead of general text colors of the platform:

It's looks strange and not consistent with other platform styles, and can also confuse users by making it appear as if they are clickable elements.

After the fix, it will look like this:

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
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Additional details and impacted files

@@            Coverage Diff            @@
##             master     #793   +/-   ##
=========================================
  Coverage          ?   93.83%           
=========================================
  Files             ?      166           
  Lines             ?     3620           
  Branches          ?      969           
=========================================
  Hits              ?     3397           
  Misses            ?      207           
  Partials          ?       16           

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