FR: Integrate github webhook events

Problem:

• Currently it seems that the app only does periodic data refreshes. This sometimes gets bottlenecked by Github throttling API requests. As such the dashboard is often left with stale data and needs manual refreshes.

Proposal1:

• Do a one time load of data and instead of periodic refreshes, rely on different webhook events to patch corresponding data object so that it always maintains a realtime mirror of the repo data.

Proposal2:

• Rely on different webhook events to maintain a list of data objects that need refresh and periodically only refresh those selected object ids.