Removed cache provider and removed styled comp

[bkarambe]

Fixes #86 BLUI-3356

Changes proposed in this Pull Request:

• Removed CacheProvider to improve performance
• Replaced Heading styled comp with style object

To Test:

• yarn start

[github-actions[bot]]

Visit the preview URL for this PR (updated for commit 3e0ea23):

https://blui-react-showcase--pr89-bug-3356-86-fix-perf-3ln1b5u1.web.app

_{(expires Sun, 24 Jul 2022 09:07:07 GMT)}

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[daileytj]

RTL is not working well. Here are a few screenshots of issues I found at a quick glance; I'm sure there are many more. I'm not going to point out every issue, but you'll easily notice the horizontal padding/margin issues. Please review each component in LTR compared to what it looked like previously.

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[bkarambe]

Declining this PR.