Minify CSS to improve performance

[nhanvvo-kobiton]

Summary

This PR allows maintainers to work on beautified .css files (which makes git versioning less error prone), while still gaining the benefits of using a minified .css file (for improved performance and stability) to generate the site. Antora will continue to use the minified site.css, it will no just be auto-generated.

Related PRs, issues, or features (optional)

• Example script: #98

Metadata

• [x] Adds new file(s)
• [x] Edits existing file(s)
• [ ] Removes file(s)

PR contributor checklist

• [x] My PR follows the Kobiton Docs contributor guidelines, meaning:

  • My content contains correct spelling and grammar.
  • My files are named and structured correctly.
  • My style and voice follows the Microsoft Style Guide.
  • I added all new pages to their section's nav.adoc file.
  • I removed all localizations (like en-us) from my URLs.