Update cssnano link

[thunfisch987]

🔗 Linked issue

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

The site cssnano.co is not available anymore so i linked their current url: https://cssnano.github.io/cssnano/

[danielroe]

thanks for spotting it!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (981ae01) to head (d77b355).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #391   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         2           
  Lines           45        45           
  Branches         6         6           
=========================================
  Hits            45        45           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.