feat: Reduce bundle size by removing classnames

[mrchief]

What does it do?

Gets rid of classnames dependency. This package was not being used for its main features anyway (just for emitting classnames conditionally).

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• Updated documentation (if applicable)
• Added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• My changes generate no new warnings

[qlty-cloud-legacy]

Code Climate has analyzed commit 65c9727 and detected 2 issues on this pull request.

Here's the issue category breakdown:

Category	Count
Complexity	2

View more on Code Climate.

[coveralls]

Pull Request Test Coverage Report for Build 1311

• 5 of 5 (100.0%) changed or added relevant lines in 5 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.1%) to 95.184%

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Totals
Change from base Build 1294:	-0.1%
Covered Lines:	581
Relevant Lines:	594

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💛 - Coveralls