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

While convenient, it causes a difference of behavior

- adds new images to premium feature sections
- fixes side bar view images to be side-by-side
- in the last step of the getting started walkthrough, add image and a button that links to the premium feature walkthrough
- updates the old settings.png image with a new version
- adds a new image of the quick setup
- adds a note about worktrees not working on the web

Adds show method to webview views

Avoids import issues

Improves template replacement bindings

Ensures supports works for worktrees and stashes
Fixes create worktree from repositories view

Adds Learn about Premium Features to command palette

Adds links footer to home view when welcome is hidden
Polishes welcome/settings page headers
Removes links from welcome page
Removes old welcome view