Bug: Create repository insight page missing CTA to create the insight

[nickytonline]

On the create a repository insight page, it's not obvious how to create it as there was no call to action on the page.

The CTA only appears once you add a repo or sync an org. The CTA should be present always (disabled if nothing selected yet), otherwise the page appears broken.

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[zeucapua]

I think we should try to simplify any "create/add" to list page like this one, workspace, and contributor insights to something more unified to avoid confusion and have a more cohesive design throughout the app. Thoughts? cc @isabensusan