Make website mobile-friendly

[dsseng]

cc @alangpierce

[codecov-io]

Codecov Report

Merging #451 into master will increase coverage by 0.1%.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           master    #451     +/-   ##
========================================
+ Coverage   81.39%   81.5%   +0.1%     
========================================
  Files          50      50             
  Lines        5177    5412    +235     
  Branches     1208    1208             
========================================
+ Hits         4214    4411    +197     
- Misses        671     706     +35     
- Partials      292     295      +3

Impacted Files	Coverage Δ
src/util/formatTokens.ts	70.58% <0%> (-10.06%)	⬇️
src/parser/util/identifier.ts	90.9% <0%> (-4.1%)	⬇️
src/parser/plugins/jsx/index.ts	91.33% <0%> (-1.48%)	⬇️
src/parser/plugins/flow.ts	63.55% <0%> (-1.26%)	⬇️
src/util/getClassInfo.ts	85.12% <0%> (-1.21%)	⬇️
src/parser/traverser/statement.ts	81.02% <0%> (-1.19%)	⬇️
src/identifyShadowedGlobals.ts	87.8% <0%> (-1.09%)	⬇️
src/util/isIdentifier.ts	100% <0%> (ø)	⬆️
src/parser/traverser/index.ts	100% <0%> (ø)	⬆️
src/parser/util/whitespace.ts	100% <0%> (ø)	⬆️
... and 17 more

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[alangpierce]

Thanks for the PRs! I'm pretty busy today, but I'll take a look at this and the other one soon.