removed sass and sass-loader dependencies

[andrejsharapov]

What is the purpose of this pull request?

• New Feature
• Bug fix
• Breaking change
• Documentation update
• Other

Description

RP removes sass and sass-loader dependencies

Additional context

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• Read the Contributing Guidelines.
• Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
• Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #yyy).

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