fix: cssnano on production

[ricardogobbosouza]

Resolve #158 A temporary solution.

Maybe this configuration of cssnano should come by default in nuxt, only in production mode

{
  cssnano: {
    preset: ['default', { discardComments: { removeAll: true } }]
  }
}

wdyt @danielroe

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Name	Link
🔨 Latest commit	57d9813
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[codecov]

Codecov Report

Attention: 12 lines in your changes are missing coverage. Please review.

Comparison is base (9722275) 89.51% compared to head (57d9813) 85.77%.

Files	Patch %	Lines
src/module.ts	29.41%	12 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #171      +/-   ##
==========================================
- Coverage   89.51%   85.77%   -3.75%     
==========================================
  Files           1        1              
  Lines         229      246      +17     
  Branches       22       23       +1     
==========================================
+ Hits          205      211       +6     
- Misses         24       35      +11     

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