feat: Replaced dropdown with toc component

[itpropro]

Replaced dropdown with toc component to remove graphical glitches, improve usability and render sub headings.

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[itpropro]

Hey @cpreston321 @pi0 anything that's blocking this from being merged? I think it's a very low hanging fruit for improving the UI in the docs ecosystem :)

[pi0]

Sorry for late response @itpropro.

Actually it is part of new design that (similar to vue, vite docs) we have a compact and minimal TOC dropdown instead of sidebar.

One other reason was that we usually don't have a lot of headings (in current unjs project docs) and it was wasting sidebar.

How do you think? Maybe we can use a responsive method to only show it on larger screens?

[pi0]

b3e97699f07c30ecf74d1c20e49f2b10c268d625 add sidebar TOC it in large screens