Embeddable UI

This project features three distinct UIs:

1. admin UI (has its own styling)
2. create form (will probably be embedded on a website)
3. confirmed/deleted views (standalone)

I got the impression that bootstrap is both overkill and even harmful for (2). So I tried to remove it and optimize the UI for embedding.

For best embedding results we could also think about parametrizing the styling, e.g. link color. But that is a rabbit hole.