chore: upgrade stylelint with TS config file

[thescientist13]

Related Issue

#245

Summary of Changes

1. Upgrade to latest Stylelint w/ TS config file fix - https://github.com/cosmiconfig/cosmiconfig/releases/tag/v9.0.1
2. Restructure GitHub Actions to avoid Node version conflicts
3. Addressed a couple new lint issues

   > wc-compiler@0.19.0 lint:css
   > stylelint "./docs/**/*.css"
   
   
   docs/styles/theme.css
     126:3  ✖  Unexpected deprecated property "clip"  property-no-deprecated
   
   docs/components/header/header.module.css
     85:16  ✖  Unexpected unknown value "extra-bold" for property "font-weight"  declaration-property-value-no-unknown
   
   ✖ 2 problems (2 errors, 0 warnings)
     1 error potentially fixable with the "--fix" option.

TODO

1. Figure out Node version mismatch issue for GitHub Actions

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