remove typings for @storybook/addon-notes

[joscha]

references #1166
blocked by DefinitelyTyped/DefinitelyTyped#17409

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

[codecov]

Codecov Report

Merging #1344 into release/3.2 will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           release/3.2    #1344   +/-   ##
============================================
  Coverage        13.76%   13.76%           
============================================
  Files              202      202           
  Lines             4621     4621           
  Branches           598      507   -91     
============================================
  Hits               636      636           
- Misses            3473     3548   +75     
+ Partials           512      437   -75

Impacted Files	Coverage Δ
addons/storyshots/src/storybook-channel-mock.js	0% <0%> (ø)	⬆️
addons/info/src/components/Node.js	0% <0%> (ø)	⬆️
app/react-native/src/bin/storybook-start.js	0% <0%> (ø)	⬆️
addons/knobs/src/components/PropForm.js	8.51% <0%> (ø)	⬆️
app/react/src/demo/Welcome.js	0% <0%> (ø)	⬆️
addons/storyshots/src/require_context.js	0% <0%> (ø)	⬆️
...rc/modules/ui/components/left_panel/text_filter.js	33.33% <0%> (ø)	⬆️
app/react-native/src/preview/story_kind.js	0% <0%> (ø)	⬆️
...react-native/src/manager/components/PreviewHelp.js	0% <0%> (ø)	⬆️
...codemod/src/transforms/update-organisation-name.js	40.62% <0%> (ø)	⬆️
... and 25 more

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[shilman]

FYI I've changed the base branch to release/3.2 because this is not a patch change.

[joscha]

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