remove skipto.css from skipto.libraries.yml

Closes #3516128

added 1 commit

• 3e822e3a - remove the two css files as well

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added 3 commits

• 3e822e3a...fb186663 - 2 commits from branch project:2.0.x
• eb60e313 - Merge branch skipto:2.0.x into 3516128-skipto-css-interferes

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