feat: introduce CSS in JS via Linaria

[jednano]

fix #14

I'm not 😍 with the fact that this PR introduces @craco/craco, but until facebook/create-react-app#6303 is addressed, there aren't a lot of options.

This PR is based off of linaria-cra.

Related Issue

#14

Motivation and Context

https://github.com/callstack/linaria/blob/master/docs/BENEFITS.md

How Has This Been Tested?

• Added a config folder to the app templates and added it to the tests.
• Updated the Home component in the app templates to use Linaria and tested expected output.
• Updated the tsx:component sub-generator to use Linaria and tested expected output.
• Ran yo tsx and then npm run cover to ensure a fresh install still passes tests.
• Ran npm start on fresh install (works).

Types of changes

• 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 change)

Checklist:

• I have signed the
  Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.