Remove typescript typings for @storybook/addon-knobs

[joscha]

references #1166
blocked by DefinitelyTyped/DefinitelyTyped#17399

Merge when https://www.npmjs.com/search?q=@types/storybook__addon-knobs shows up

[codecov]

Codecov Report

Merging #1339 into release/3.2 will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           release/3.2    #1339   +/-   ##
============================================
  Coverage        13.76%   13.76%           
============================================
  Files              202      202           
  Lines             4621     4621           
  Branches           598      501   -97     
============================================
  Hits               636      636           
- Misses            3473     3553   +80     
+ Partials           512      432   -80

Impacted Files	Coverage Δ
app/react/src/client/preview/reducer.js	0% <0%> (ø)	⬆️
lib/ui/src/modules/shortcuts/actions/shortcuts.js	6.25% <0%> (ø)	⬆️
addons/info/src/components/Node.js	0% <0%> (ø)	⬆️
addons/info/src/components/PropTable.js	0% <0%> (ø)	⬆️
lib/ui/src/modules/ui/configs/init_panels.js	25% <0%> (ø)	⬆️
addons/knobs/src/components/types/Object.js	5.81% <0%> (ø)	⬆️
app/react/src/server/babel_config.js	44.82% <0%> (ø)	⬆️
addons/storyshots/src/storybook-channel-mock.js	0% <0%> (ø)	⬆️
lib/ui/src/modules/ui/routes.js	0% <0%> (ø)	⬆️
lib/ui/src/modules/ui/configs/handle_keyevents.js	33.33% <0%> (ø)	⬆️
... and 21 more

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[joscha]

@shilman changed the base here as well.

[joscha]

The DefinitelyTyped package has been released, can I merge this into the 3.2 branch @ndelangen @shilman?