[DO AT BREAKING CHANGE RELEASE] Scope git tag module name

[interactivellama]

rename module to @salesforce-ux/design-system-react instead design-system-react

This will break existing ssh+git tag imports.

Currently the npm package is scoped, but the git tag is not, so if you already use NPM, your components shouldn't break.

[interactivellama]

This will be done at 1.0 release.