fix(website): make 404 page good again

[abrahamguo]

PR Checklist

• Addresses an existing open issue: fixes Website: 404 page is boring again #8741
• That issue was marked as accepting prs
• Steps in Contributing were taken

Overview

NotFound => NotFoundContent, and PageMetadata and Layout are also not needed anymore 👍🏻

[typescript-eslint]

Thanks for the PR, @abrahamguo!

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The core maintainers work on this in their personal time, so please understand that it may not be possible for them to review your work immediately.

Thanks again!

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✅ Successfully ran 31 targets

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• nx test parser
• nx test rule-schema-to-typescript-types
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• nx test ast-spec
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• nx test repo-tools --coverage=false
• nx test scope-manager --coverage=false
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[JoshuaKGoldberg]

😄 thanks!

[JoshuaKGoldberg]

..oh, except for the lint issues:

/home/runner/work/typescript-eslint/typescript-eslint/packages/website/src/theme/NotFound/Content/index.tsx
  2:10  error  'PageMetadata' is defined but never used. Allowed unused vars must match /^_/u  @typescript-eslint/no-unused-vars
  3:8   error  'Layout' is defined but never used. Allowed unused vars must match /^_/u        @typescript-eslint/no-unused-vars

Got a moment to fix for them?

[armano2]

there seem to br also small issue on firefox, this underline image seem to be missaligned

[github-actions]

Uh oh! @armano2, the image you shared is missing helpful alt text. Check #8750 (comment).

Alt text is an invisible description that helps screen readers describe images to blind or low-vision users. If you are using markdown to display images, add your alt text inside the brackets of the markdown image.

Learn more about alt text at Basic writing and formatting syntax: images on GitHub Docs.

🤖 Beep boop! This comment was added automatically by github/accessibility-alt-text-bot.

[JoshuaKGoldberg]

Thanks!