Add Assets to Classic

[allanaaa]

Classic, and particularly .net, has no ability to add site asset files other than logo+header. For people who are using .net as an affordable and reliable hosting solution, it makes little sense to limit their file-hosting access when images are needed elsewhere on the site.

(I have been attempting to host asset files on a private item and call the images with HTML, but that obviously isn't working because of AWS token expiry.)

I think we can encourage better (and more visually appealing) use of Omeka Classic and .net by adding broader asset hosting.