refactor(components, hooks): rewrite ToC and useHeadingsTree

* replace TableOfContents component with TocWidget to keep the name of
widget components coherent
* replace `wrapper` prop with `tree` prop (the component no longer uses
the hook, it is up to the consumer to provide the headings tree)
* let consumer handle the widget title
* add options to useHeadingsTree hook to retrieve only the wanted
headings (and do not assume that h1 is unwanted)
* expect an ref object instead of an element in useHeadingsTree hook
* rename most of the types involved

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