Add to (OpenSauced) insight repo button

[bdougie]

Today when a user is exploring they can add a project to an insights page on OpenSauced. I would love a feature when they can add a repo to a page while browsing GitHub.

My thought is adding a dropdown to a voting button. Similar to the star list dropdown.

[diivi]

I can take this if Anush works on #71, we discussed an approach before about adding Github's dropdown (add to list), next to the upvote button to add a repo to an insight.

That approach won't be as customizable as putting these options in the extension popup though, because we will have to use github's classes and styles.

[bdougie]

We should use the GitHub UI for this. The end point for seeing insights exist here: https://api.opensauced.pizza/#/Insights%20service/addInsightForUser

If no insight pages existing the user can be sent to https://insights.opensauced.pizza/hub/insights/new

Finally here is a mock of the dropdown coming in the insights app for reference. Again use the GitHub UI elements. We don't need to copy it, just sharing for reference.