CHANGE lib/theming so it no longer depends on react-inspector

[ndelangen]

Issue: #6764

What I did

COPY the chromeDark & chromeLight variables into the module itself

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[ndelangen]

This adds the code for theming the syntaxhighlighter into lib/theming instead of pulling it from react-inspector.

We might want to create packages for these themes, so we can share this code again.

If anyone would be interested in creating those packages?

[ndelangen]

@beauroberts could you help us review this?

[beauroberts]

LGTM, although I suspect the actual source of the error I encountered might reside in addon-actions:

ActionLogger imports Inspector from storybooks/react-inspector. The different inspector implementations (DOMInspector, ObjectInspector) import TreeView, which makes use of hooks and memo, both unavailable in React < 16.6, (or 16.8 in the case of hooks).

But this will probably sort my issue if I remove use of the Actions addon. Thank you!