Add accessibility remediation request form and button

[carakey]

Descriptive summary

This ticket is part of the larger ADA Title II compliance effort.

Users should be able to request an accessible version of a work, with as little burden to them as possible. This ticket is to add an accommodation request pathway: "Request Accessible Version" button on work pages, which leads to a pre-populated form, which triggers an email to SA admins for remediation and follow up.

See the implementation of this from UNC in the Carolina Digital Repository: example work + request form.

I can follow up with specific language to use.