After completion of #1128, need to add alt-text to each image ~~and video~~ (see #1509) in use to meet accessibility requirements
Workflow is described in GD document, media-metadata-alttext workflow and instructions
alt-text generated for all MVP-essays as of this posting.
Archival tabs in the spreadsheet media-full-list-alt-text show drafts of alt-text, many too long and overly descriptive.
Still not finished: charts, graphs, diagrams, and other complex forms; and videos (which do not require alt-text in the same way as the images - they will receive descriptive titles/captions instead)