update build and add custom transforms

[kmcfaul]

Closes #1

Instead of using the basic built in style dictionary build command this expands the build script to include extra logic setting up custom transforms that are applied to the Json tokens. It also adds a custom transform group that all our configs can share.

Also removes some unused configs.

[srambach]

Great! 🎉 Could we look together at the CSS outputs sometime? Maybe these should be checked in to a dist directory?

[kmcfaul]

Adding the build directory to the repo to allow easy access to the build SCSS files (not requiring the repo to be cloned/built locally). Future PRs that would effect the SCSS output should be rebuilding and recommitting the updated files automatically but there is the possibility of these files getting out of date, so we can remove this from the repo down the line if it becomes a problem. Also added a readme note.

[github-actions[bot]]

:tada: This PR is included in version 1.0.0 :tada:

The release is available on:

• GitHub release
• npm package (@prerelease dist-tag)

Your semantic-release bot :package::rocket: