PXG-1351: fix moderate security vulnerability in postcss by upgrading stylelint

[hanllo]

• Fixes last moderate vulnerability according to npm audit:

postcss  <8.4.31
Severity: moderate
PostCSS line return parsing error - https://github.com/advisories/GHSA-7fh5-64p2-3v2j
fix available via `npm audit fix --force`
Will install stylelint-order@6.0.4, which is a breaking change
node_modules/postcss
  autoprefixer  1.0.20131222 - 9.8.8
  Depends on vulnerable versions of postcss
  node_modules/autoprefixer
    stylelint  0.1.0 - 13.13.1
    Depends on vulnerable versions of autoprefixer
    Depends on vulnerable versions of postcss
    Depends on vulnerable versions of postcss-less
    Depends on vulnerable versions of postcss-safe-parser
    Depends on vulnerable versions of postcss-sass
    Depends on vulnerable versions of postcss-scss
    Depends on vulnerable versions of sugarss
    node_modules/stylelint
      stylelint-order  <=4.1.0
      Depends on vulnerable versions of postcss
      Depends on vulnerable versions of postcss-sorting
      Depends on vulnerable versions of stylelint
      node_modules/stylelint-order
      stylelint-scss  0.0.0-alpha.1 || 1.0.0 - 3.21.0
      Depends on vulnerable versions of stylelint
      node_modules/stylelint-scss
  postcss-less  <=3.1.4
  Depends on vulnerable versions of postcss
  node_modules/postcss-less
  postcss-safe-parser  <=4.0.2
  Depends on vulnerable versions of postcss
  node_modules/postcss-safe-parser
  postcss-sass  <=0.4.4
  Depends on vulnerable versions of postcss
  node_modules/postcss-sass
  postcss-scss  <=2.1.1
  Depends on vulnerable versions of postcss
  node_modules/postcss-scss
  postcss-sorting  <=5.0.1
  Depends on vulnerable versions of postcss
  node_modules/postcss-sorting
  sugarss  <=2.0.0
  Depends on vulnerable versions of postcss
  node_modules/sugarss

• Achieved by upgrading stylelint one major version which then needed a lot of little lint fixes
• Majority of changes are simple whitespace changes
• Some more interesting ones:
  • changing if $something == null to if not $something: https://github.com/stylelint-scss/stylelint-scss/blob/master/src/rules/at-if-no-null/README.md
  • preferring shorthand for border-radius and padding properties: https://stylelint.io/user-guide/rules/declaration-block-no-redundant-longhand-properties/
• Changes from .stylelintrc to stylelint.config.js as it is preferred

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