Sort out the server-side UX

[danielballan]

We need the user to specify:

• which directory
• public or not (--public)

And we want to leverage the napari I/O plugins in Tiled Adapters so that the data read by the server is identical (same data type, etc.) to what napari would have read directly. This could be done with a config file:

tiled serve config config.yml

But something with less friction would be nice. (Gotta obtain and locate that config file....)

We could not a custom executable installed by the napari-tiled plugin

napari-tiled ...

but we don't love that because it implies that this is not a general tiled server that you could use for other things.