docs: fix cssnano optimisations link broken

[stu01509]

This PR contains a:

• bugfix
• new feature
• code refactor
• test update
• typo fix
• metadata update

Motivation / Use-Case

Breaking Changes

Fix cssnano optimisations link broken

AS IS
https://cssnano.co/docs/what-are-optimisations/

TO BE
https://cssnano.github.io/cssnano/docs/what-are-optimisations/

Additional Info

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: stu01509 / name: Cliff Su (0caf957, 48585cd)

[alexander-akait]

Please use prettier to fix the problem

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.09%. Comparing base (2ce7dc0) to head (0caf957).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #260   +/-   ##
=======================================
  Coverage   96.09%   96.09%           
=======================================
  Files           3        3           
  Lines         282      282           
  Branches      111      111           
=======================================
  Hits          271      271           
  Misses         11       11           

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[alexander-akait]

Thank you