[2.x] Blade-based colored Markdown blockquotes

[emmadesilva]

Part of #2006

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (1458c8b) to head (9731a8d).
Report is 27 commits behind head on new-asset-system.

Additional details and impacted files

@@                 Coverage Diff                  @@
##             new-asset-system     #2056   +/-   ##
====================================================
  Coverage              100.00%   100.00%           
  Complexity               1931      1931           
====================================================
  Files                     196       196           
  Lines                    5138      5139    +1     
====================================================
+ Hits                     5138      5139    +1     

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