chore(docs): use vitepress

[ota-meshi]

This PR changes to use vitepress instead of vuepress to build the site.

#19 is not needed if we merge this PR.

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preview https://ota-meshi.github.io/eslint-plugin-eslint-comments/

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (3b53a57) 97.87% compared to head (250e6a7) 97.87%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #114   +/-   ##
=======================================
  Coverage   97.87%   97.87%           
=======================================
  Files          17       17           
  Lines         282      282           
=======================================
  Hits          276      276           
  Misses          6        6           

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[voxpelli]

The resulting page looks nice 👍

I have no personal experience with Vitepress, only ever used Eleventy (and Jekyll), but if it works for you and you like it then I see nothing to object to here.

Disclaimer: I haven't looked through every single line of the code

Random remark: I see that this repo contains a mix of filename conventions – kebab case, pascal case and camel case. Apart from the lack of consistency I would advice against using pascal case or camel case for files as it can cause unexpected differences between case-sensitive and case-insensitive file systems.