Use csstree-validator to validate CSS #12
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Fixes #11
The previous version of the tests used the css-validator library, which uses the WC3 CSS validator via a network request and runs asynchronously. This caused tests to timeout for some students as reported in #11.
To resolve this issue, I changed the tests to use the csstree-validator library, which runs synchronously and doesn't rely on any network requests to validate a CSS file.