[Docs] Develop 'Vizarr Capabilities' documentation

[AlexSurtees]

A document which displays the capabilities of the Vizarr reader e.g. images that can be loaded via the Viewer along with descriptive metadata about the 'features' of that image.

Useful links from other attempts at something similar:

https://github.com/clbarnes/capability-manifest

https://github.com/clbarnes/ome_zarr_conformance

https://github.com/zarr-developers/zarr_implementations
zarr-developers/zarr_implementations#57
https://github.com/ome/ome_zarr_test_suite

https://github.com/ome/ome_zarr_test_suite 

zarr-developers/zarr_implementations#57

 https://github.com/zarr-developers/zarr_implementations 

https://github.com/clbarnes/ome_zarr_conformance 

 https://github.com/clbarnes/capability-manifest