Use IIIF for basic image viewer

[loafofpiecrust]

On the page for each manuscript, we have a viewer that displays images of the original text. Currently, that's using static URLs of the medium size version of the image from Yale. We want to replace that viewer with one that actually uses IIIF directly, taking advantage of scaling to reduce the initial page load while letting you zoom in to see the greatest detail. Depends on #83. iiif-prototypes

• [ ] Make a list of potential JS/React IIIF viewer components.
• [ ] Replace the existing viewer with the IIIF one.
• [ ] Reimplement pagination.
• [ ] Make sure this works across every document, especially multipage ones.

[rchavez-neu]

FWIW: check out the Image Viewing Client section here (https://iiif.io/apps-demos/#awesome-iiif) for a list of open source IIIF compatible/supportive image viewing clients. There are some interesting options here.