Updating Zeiss links (rebased onto develop)



This is the same as gh-1144 but rebased onto develop.

----

As per discussion between Jason and Zeiss people - updating the links and changing references to 'Carl Zeiss Microscopy' throughout.

They also asked if the .czi file extension in the supported formats table could be made into a hyperlink - I assumed not  but will update the PR if it is possible.

                    
Yes, there are a couple of formats which have no extensions defined in the source `formats-pages` file but the `supported-formats.txt` was erroneously re-using the extensions of the previous format.