Staging AR examples UX

[Utopiah]

Tried the Glitch and examples-browser/staging/stage-room-ar (apparently different version) but in both case trying to furnish a non defined room results in HTTP error 400 (Glitch) or 500 (master).

Might be better to hide or disable those buttons until the floor plan is done.

[frederic-schwarz]

Thanks for input. Will adapt the demo / example.

[frederic-schwarz]

@Utopiah the version difference is probably due to the demo referencing a feature branch not master
https://github.com/archilogic-com/3dio-js/tree/dynamic-entities/examples-browser/staging/stage-room-ar
this version should be the same version as on glitch