v8.0.0

⚠️ This update may not be backwards-compatible with the previous versions.

What's changed

• ⁉️ Wrap all selectors in :where for better developer control over the styling
• 🧹 Compress a few selectors and rules to save space
• 🧹 Convert comments from /* */ to // so that they are not inserted in the final stylesheet
• 🧹 Add less-plugin-clean-css and configure it to build minified versions of the stylesheets
• 📔 Unmark purplestar as experimental
• ✨ #61: Center text in <header>s