Clean up comment CSS

[Ninjaclasher]

Part of #2035.

• Move comment CSS from HTML to SCSS
• Colour changes:
  • #fafafa -> #f8f8f8 (color_primary5)
  • #888 -> #808080 (color_primary50)
  • #444 -> #3b3b3b (color_primary75)
• Colour renames:
  • #ccc -> color_primary25
  • #2980b9 -> highlight_blue

Light theme:

Dark theme:

[codecov-commenter]

Codecov Report

Base: 46.44% // Head: 46.44% // No change to project coverage 👍

Coverage data is based on head (38b8a94) compared to base (3245fb3).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2070   +/-   ##
=======================================
  Coverage   46.44%   46.44%           
=======================================
  Files         236      236           
  Lines       13072    13072           
=======================================
  Hits         6071     6071           
  Misses       7001     7001           

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[Xyene]

LGTM, thanks!