v0.5.2

Changed

• Bump lightningcss to alpha60
  • Fix system-color in color-mix
  • Fix order of fallback size properties
  • Fix error handling in calc commands
• Restrict invalid argument warning to keylike strings
• Minor code changes and lints
• Improve docs

Note: The attached .deb package requires an x86-64-v3-capable CPU. You can use this script from the XanMod Kernel project to verify your system's support level if you're unsure.