Is the goal of the project to let people write documentation for APIs, explore APIs, or something else?
Here are a few suggestions:
1. Start with a clear story of why you built this. Not lock in etc, but what were you or your team trying to do? That will help me understand whether I too try to do this thing.
2. Now you can tell me about all your frustrations, and I as a fellow misery drenched individual will say "Yes! I too have suffered the lack of cloud sync lock-in!"
3. Let me see it! Is there a way to embed the actual editor in the browser? Barring that putting a heading over the video, or a caption telling us what you're doing. When I click around to explore, let me click on those screenshots so I can see what you've built.
All in all, this looks really neat, but the challenge with building something divergent is that you need to invest more effort in telling the story.