fix(octicons_react): remove build from npm package files

[joshblack]

Closes #998

This removes build from the list of files for the npm package. These files are not accessible since we currently use the exports field so removing this should be compatible within semver (but let me know if not!)

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[broccolinisoup]

These files are not accessible since we currently use the exports field so removing this should be compatible within semver (but let me know if not!)

That makes sense to me!

[fregante]

Hmm why not just merge my PRs?

[camertron]

@fregante I'm not 100% sure in this case, but we usually do this because certain actions won't run from forks.

[joshblack]

I'm sorry about that @fregante, that's totally on me. I'd be happy to revert this one and merge in yours if you would be interested!

[fregante]

No problem to leave as is, I was just wondering