Upgrade to Storybook 6

[Coteh]

There's some breaking changes and deprecations that I'm still sorting out so leaving this in draft for now.

Using this guide: https://medium.com/storybookjs/storybook-6-migration-guide-200346241bb5

Remaining items to be done in #998

Checklist:

• Remove withKnobs decorator since it's now baked in with its preset (source)
• Remove TypeScript configuration since there's now a baked in default (source)
• Switch addons-info, which is now deprecated, to addons-docs (source)
• Consider switching addons-knobs to Storybook Controls
• Convert story items to use Storybook Args (source)
• Ensure everything else from Migrations guide is checked off
• Consider adding MDX documentation to stories (should probably make this a separate issue that can be dealt with later, since it's more of a nice-to-have) (source)
• Bump to 6.0.12
• Bump to newest minor version before pushing

[codecov]

Codecov Report

Merging #996 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #996   +/-   ##
=======================================
  Coverage   52.58%   52.58%           
=======================================
  Files         142      142           
  Lines        3564     3564           
  Branches      168      168           
=======================================
  Hits         1874     1874           
  Misses       1623     1623           
  Partials       67       67           

Flag	Coverage Δ
#golang	72.03% <ø> (ø)
#typescript	22.40% <ø> (ø)

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