chore(docs): add site theme for dark mode

[ota-meshi]

This PR adds a dark mode theme to the documentation site.

close #83

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (80b934e) 96.93% compared to head (18b8d62) 96.93%.

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Additional details and impacted files

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##             main      #84   +/-   ##
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  Coverage   96.93%   96.93%           
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  Files          13       13           
  Lines        2090     2090           
  Branches      388      388           
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  Hits         2026     2026           
  Misses         63       63           
  Partials        1        1           

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[RunDevelopment]

That works wonders! Thank you!

On that note, I also noticed that the green used for the required Node version is quite dark as well. Would it be possible to lighten up that color too?

[ota-meshi]

Thank you for pointing out.
But the custom container theme is using the vitepress default theme.
It seems that it is still being improved frequently even now, so I would like to deal with it only if there is a problem even after it becomes GA.
vuejs/vitepress#1989

[RunDevelopment]

I'll make them an issue.

[ota-meshi]

@RunDevelopment Thank you for checking this PR!

[MichaelDeBoey]

@ota-meshi Can we have this in our other repos as well please?

[ota-meshi]

We could use the same theme in another repo, but I think eslint-utils and eslint-plugin-es-x are the only repos currently using vitepress on the documentation site. If we also replace vuepress with vitepress in other repo, we can use the same theme.
I will replace vuepress with vitepress when I have time.

[github-actions]

🎉 This PR is included in version 4.4.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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