chore: limit packed files

[smackfu]

Description

Currently a bunch of junk is in the packed tar.gz like tests and github actions.

This changes to only include the lib dir plus other npm defaults.

$ npm pack

> @americanexpress/vitruvius@3.0.1 prepare
> husky install

husky - Git hooks installed
npm notice
npm notice 📦  @americanexpress/vitruvius@3.0.1
npm notice Tarball Contents
npm notice 10.3kB LICENSE.txt
npm notice 2.6kB README.md
npm notice 1.3kB lib/collectBuiltState.js
npm notice 1.5kB lib/immutable.js
npm notice 1.3kB lib/index.js
npm notice 2.0kB package.json

This decreases the size from 17.9kb packed to 6.5kb.

[10xLaCroixDrinker]

Can you instead use an .npmignore?

[smackfu]

Can you instead use an .npmignore?

This article makes it seem like files is better?
https://medium.com/@jdxcode/for-the-love-of-god-dont-use-npmignore-f93c08909d8d

[github-actions]

This pull request is stale because it has been open 30 days with no activity.

[smackfu]

#57 conflicts with this.