fix: Allow importing css from npm package

[mdmower-csnw]

Summary

Beginning with v8.0.0, exports from the npm package are restricted. Projects should still be able to import lib/index.css and lib/uswds.css. Add them to the conditional exports in package.json.

Related Issues or PRs

See comment at #2716 (comment)

How To Test

Add import '@trussworks/react-uswds/lib/index.css'; to any project .ts/.tsx file.

[mdmower-csnw]

@jpandersen87 and/or @werdnanoslen - would you mind reviewing?

[jpandersen87]

Thanks for bringing this up. I have this change alongside some other fixes for 8.0.0 here: #2820

[mdmower-csnw]

Thanks for bringing this up. I have this change alongside some other fixes for 8.0.0 here: #2820

While all your work on these fixes is very much appreciated, it's worth pointing out that combining fixes from others under your own name discourages outside contributions since there's no recorded contributions from those other people in the commit history.

[jpandersen87]

You are absolutely correct and I apologize for this error. I am still new to practices with being a contributor to outside projects vs. a codeowner. I will rebase my branch off of yours so that the git history properly attributes you as the source for the css changes, with all other changes coming from me onwards.

[jpandersen87]

This has been done. Apologies again @mdmower-csnw.

[werdnanoslen]

@mdmower-csnw if you can update your branch, we can merge this :)