fix: Bootstrap mixins

[bmingles]

• Fixed semantic color mappings for forms and emphasized text. Validation error labels are now red instead of white. Link sample added to the styleguide to show proper colors that were incorrectly white before
• Added anti-aliasing to button text
• font-weight is now bold for outlined buttons (consistent with Spectrum)

#1693

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c8a74a2) 46.73% compared to head (68e5a3a) 46.74%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1692   +/-   ##
=======================================
  Coverage   46.73%   46.74%           
=======================================
  Files         606      606           
  Lines       36757    36762    +5     
  Branches     9227     9227           
=======================================
+ Hits        17179    17184    +5     
  Misses      19526    19526           
  Partials       52       52           

Flag	Coverage Δ
unit	46.74% <100.00%> (+<0.01%)	⬆️

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