feat: Styling for blockquotes

[mgax]

Fix #321.

Here is what the blockquotes look like with this patch:

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.72%. Comparing base (4ad3143) to head (b2e7e64).
Report is 7 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #402   +/-   ##
=======================================
  Coverage   82.72%   82.72%           
=======================================
  Files         124      124           
  Lines        2599     2599           
=======================================
  Hits         2150     2150           
  Misses        449      449           

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[SharmaineLim]

Looking good, just need to tweak the text colour for accessibility.

I would suggest replacing the colour instead of relying on opacity. Maybe #666666 and #bebebe which are already in use elsewhere.

[mgax]

Looking good, just need to tweak the text colour for accessibility.

Good point, and thanks for the resource! The text colour is more similar to the body text, but it's slightly heavier, and there's the indentation bar, so I don't think that will be a problem.