Optimise plugin css

[PatelUtkarsh]

Summary

Plugin loads duplicate component bundled CSS when theme is active, This removes duplicate component CSS when material theme is active by registering front-end-w-theme css entry point.

Saves around 109kb uncompressed (10.55kb compressed) CSS for frontend.

Screenshot:

Optimized version

Unoptimized

Checklist

• [ ] My pull request is addressing an open issue (please create one otherwise).
• [ ] My code is tested and passes existing tests.
• [ ] My code follows the Contributing Guidelines (updates are often made to the guidelines, check it out periodically).

[coveralls]

Pull Request Test Coverage Report for Build 2935116139

• 11 of 11 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.02%) to 70.737%

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Totals
Change from base Build 2932434630:	0.02%
Covered Lines:	4664
Relevant Lines:	6447

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💛 - Coveralls