Lk/use share browserlist

[leangseu-edx]

TL;DR -

• start using share browserlist like other repo (Similar to build: use shared browserslist config and remove is-es5 check frontend-app-learning#728)
• upgrade paragon to remove depreciated postcss from bootstrap
• fix grade modal always showing from previous migration Migrate off paragon modal deprecated component  #275

[codecov]

Codecov Report

Base: 100.00% // Head: 100.00% // No change to project coverage 👍

Coverage data is based on head (5de8c08) compared to base (ecceda2).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #299   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          109       109           
  Lines         1263      1260    -3     
  Branches       248       248           
=========================================
- Hits          1263      1260    -3     

Impacted Files	Coverage Δ
src/components/GradesView/EditModal/index.jsx	100.00% <ø> (ø)
src/components/GradesView/GradebookTable/index.jsx	100.00% <100.00%> (ø)

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[nsprenkle]

Builds and fixes the issue for me locally