Removes GK auth extension dependency

Updates upgrade notification

Adds a limit on the number of queries

- adds headings, and moves the majority of text content to the body of each step
- most steps now have a simple, one-line description
- adds "try now" section to premium feature walkthrough with a button to try
- adds and updates content in premium feature introduction step
- removes an unnecessary file

Aligns with other gate messaging states
  Simplifies context keys for premium
Fixes purchase link to point to account site
Polishes other gate messaging

Reduces startup impact

Changes context to be Uri based rather than editor

Events are better aggregated and bootstrapped
Resizing should be smoother and behave much better
Adds refresh on repository changes
Adds new empty message