ISTWCMS-4910: updating .gitignore to ignore specific css files that are only...

Eric Bremnerrequested to merge
feature/ISTWCMS-4910-ebremner-minify-css into 3.0.x

ISTWCMS-4910: updating .gitignore to ignore specific css files that are only required for pattern-lab and now use minified css in themes

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