Update or swap imports for the documentation repo

[caw310]

Description

Now that we are done with formation deprecation, we need to update packages to make sure our style imports are coming from css-library.

Considerations

• We'll need to update this css-library import
• The doc site still relies heavily on v1 grid, which we patched directly in vets-website. We'll need to migrate grid first before fully removing formation from the doc site.
• There's extensive use of scss variables in /assets/stylesheets/ throughout many stylesheets. It's possible there are some being used in here that we don't carry in css-library, such as $font-bold and $font-sans in the _do-dont.scss stylesheet. Instances like this will need to be updated to whatever their equivalents are from the variables we do generate. Running a yarn watch will likely throw variable errors for these once import paths are updated.

Tasks

• Update these stylesheet imports to point to css-library. It's possible imports from css-library will need to include mixins, functions, and utilities.
• Update the css-library version in package.json

Acceptance Criteria

• Import paths have been updated for the doc site so they point to css-library

[powellkerry]

There is a reference to an example of how to import base css styles in src/_foundation/spacing-units.md, it was temporarily removed when documentation was updated to remove mention of formation. This should be re-added as part of this work as the code in the example should reflect css-library imports.

[caw310]

Provide your estimate of 1, 2, 3, 5, 8 or 13
@Andrew565 - 5
@ataker - 3
@harshil1793 - 5
@it-harrison - 5
@jamigibbs - 3
@micahchiang -
@powellkerry - 5
@rmessina1010 - 2
@rsmithadhoc - 3

[Andrew565]

Pretty sure this will be blocked by #3640.

[powellkerry]

I did a bit of work trying to see if I could quickly switch this out for testing out changes to list styles. See this branch.

[powellkerry]

This PR should be merged after this work is complete: department-of-veterans-affairs/component-library#1508