grouping and folding feature#131

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jjagielka wants to merge 5 commits intoplotly:masterfrom

jjagielka:master

Commits on Apr 5, 2021

grouping and folding feature
jjagielka
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Commits on Aug 20, 2021

prepare for publish
jjagielka
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Commits on Aug 23, 2021

Update README.md
jjagielka
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Commits on Jan 21, 2022

Update README.md
jjagielka
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Commits on Jan 26, 2022

Extended with styles for level 3 and 4
jjagielka
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