Feature/status bar git head

[agileandy]

When working with agentic coding tools it is imperative to ensure the agent is working on the piece of code. Knowing git head is key to this.

This is a simple feature to shorten the cwd than add the git head info.

The change is theme aware so will blend in with the overall look and feel

[adamdotdevin]

hey, not opposed to this idea, but the PR needs cleaning up if i'm going to take a look (deleted the README? other unrelated stuff in there)