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