Add demo GIF as hero image in README

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: johannesjo

README.md

@@ -2,12 +2,10 @@
 
 A desktop app for running multiple AI coding agents side by side, each in their own isolated git worktree.
 
-![Parallel Code — multiple AI agents working side by side](screens/parallel-tasks.png)
+![Parallel Code demo](screens/demo.gif)
 
 Parallel Code lets you dispatch tasks to AI coding agents — Claude Code, Codex CLI, or Gemini CLI — and watch them work simultaneously. Each task gets its own git branch and worktree, so agents never step on each other's code. When a task is done, merge it back to main with one click.
 
-<video src="screens/demo.mov" width="100%"></video>
-
 ## Screenshots
 
 | Agent working on a task | Commit & merge workflow |