Better scope sample page component styles

[kylegach]

What I did

• Prepend each selector in the page.css template file with "section ", to scope the styles to the component
  • You can see how the unscoped styles were affecting Docs-page elements in the Before/After
  • I scoped the styles in a way that didn't require changes to the Page component templates themselves; scoping with a class name would be better practice, though

Before

After

How to test

• Is this testable with Jest or Chromatic screenshots?
• Does this need a new example in the kitchen sink apps?
• Does this need an update to the documentation?

If your answer is yes to any of these, please make sure to include it in your PR.

[nx-cloud]

Nx Cloud Report

CI ran the following commands for commit 3f15cd2. Click to see the status, the terminal output, and the build insights.

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Status	Command
	nx run-many --target=prepare --all --parallel --max-parallel=15

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[shilman]

LGTM