Looks sweet. I might actually use this. A few questions:
1. Why a custom JS-based CLI tool for deployment? What does it do? Why not something like plain SSH?
2. What is the plan for this? Presumably you'll want to monetize the project? Will you ever add ads to my sites? Or will you offer premium features?
3. What's the reason for the NoSQL DB?
4. Your CLI tool only allows .png files as images. Is there a reason you don't allow any other types?
5. Is there a limit on the number of sites you can have or the storage you can use?