MOVE ui into it's own group

[ndelangen]

improved the official storybook a bit so the ui section has a proper own heading

[codecov]

Codecov Report

Merging #3884 into master will not change coverage.
The diff coverage is 66.66%.

@@           Coverage Diff           @@
##           master    #3884   +/-   ##
=======================================
  Coverage   41.44%   41.44%           
=======================================
  Files         455      455           
  Lines        5193     5193           
  Branches      903      903           
=======================================
  Hits         2152     2152           
  Misses       2496     2496           
  Partials      545      545

Impacted Files	Coverage Δ
...ui/src/modules/ui/components/search_box.stories.js	60% <0%> (ø)	⬆️
...rc/modules/ui/components/shortcuts_help.stories.js	57.14% <0%> (ø)	⬆️
.../ui/src/modules/ui/components/menu_item.stories.js	100% <100%> (ø)	⬆️
...dules/ui/components/stories_panel/index.stories.js	91.66% <100%> (ø)	⬆️
...onents/stories_panel/stories_tree/index.stories.js	94.44% <100%> (ø)	⬆️
...ui/components/stories_panel/text_filter.stories.js	100% <100%> (ø)	⬆️

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[igor-dv]

Maybe you can also remove this:

😳

[ndelangen]

@igor-dv sure, I'll try and get that in a better shape as well soon!