CSS validator/linter t9 GitHub Actions workflow

[Programmer80101]

CSS Linter

Add CSS linter to GitHub Actions workflow. It automatically catches CSS typos, errors, and issue.

It identified a significant number of issues.
Fix issue #80.
You can fix some of those errors by running the following code:

npx stylelint **/*.css --fix

[postmodern]

Noticed one minor thing with argument quoting.

[postmodern]

@Programmer80101 any reason why we shouldn't use the actions-hub/stylelint GitHub Actions action? This looks ready to be merged, but just wanted to make sure there was a reason to not use the stylelint GitHub action.

[Programmer80101]

@Programmer80101 any reason why we shouldn't use the actions-hub/stylelint GitHub Actions action? This looks ready to be merged, but just wanted to make sure there was a reason to not use the stylelint GitHub action.

Not using stylelint Github action allows more customization and flexibility. Using stylelint GitHub action is definitely better in some ways.