docs: fix default value of config (#626)

[Knagis]

This PR contains a:

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

Motivation / Use-Case

Fix the default value of config in docs to match the implementation.

Added a note suggesting to disable automatic config for performance reason (for example, in our big monorepo with thousands of css files we see 10-20 second improvement for the big 10 minute build).

Breaking Changes

None

Additional Info

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.29 ⚠️

Comparison is base (f6e1cde) 89.33% compared to head (5bc8e8b) 89.04%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #627      +/-   ##
==========================================
- Coverage   89.33%   89.04%   -0.29%     
==========================================
  Files           5        5              
  Lines         347      347              
  Branches      113      113              
==========================================
- Hits          310      309       -1     
- Misses         34       35       +1     
  Partials        3        3              

see 1 file with indirect coverage changes

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[alexander-akait]

Thank you