FYI the ObservableJS extension for VS Code lets you create either an OJS (Observable JavaScript) or OMD (Markdown with embedded OJS) file, which you can then import an entire notebook into.
You can then export that file to HTML which creates a simple single page version of the notebook.
The main difference with this is that the Notebook is interpreted at runtime on the client machine so doesn’t need a server (and you can still import controls and the like directly from Observable).