404 page, localisation improvements

[its-miroma]

• Implement 404 page
• Add more localisation strings
• Show page authors who contributed outside GitHub
• Update to latest vitepress-versioning-plugin version
• Update scrollbar colors
• Move LICENSE.md to LICENSE
• Improve contributing.md file
• Fix miscellaneous Markdown issues
  • Fix weird escapes in some translated links
  • Codec<Map> is getting out of hand
• Add markdownlint-rule-search-replace rules
  • missing-heading-anchor: All headings must have anchors
  • no-absolute-links: No absolute links allowed
  • no-curly-quotes: No curly quotes allowed
  • no-file-extension-in-links: Links should not have an extension
  • no-multiple-spaces: Yeah, no multiple spaces,
  • no-punctuation-in-links: Punctuation should not be clickable
  • no-trailing-whitespace: Extend MD009 to code blocks

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