Feature summary (what you would like to be able to do and where):
I would like to be able to create an Index: page on wikisource, that by having an IIIF path field, can utilise an externaly hosted resource
IIIF is an API supported by various sites such as Archive.org/National Library of Scotland and others to procvide high quality images of manuscripts and works they have scanned into digitial archives.
Creating an Index page would be at present, but with the difference that the requests for Page:s would be made to the external host, rather than to a file hosted on Commons.
Benefits (why should this be implemented?):
Reduced file storage and thumbnail concerns on Commons.
Faster access to high quality images on Wikisource.
I am asking for this as a result of a comment made during a disscussion about the 429 outage in thumbnail images recently., where it was suggested that uploading indvidual JPG/TIFF images for a works was a possible alternate to uploading huge PDF or DJVU. Supporting IIIF resources based Index would essentially be doing this, but with the images remaining on the external providers site. Also Some GLAM already have thier own digital galleries, and having this functionality on Wikisource would also allow them to more quickly setup transcription projects in the Wikimedia sphere.