- rename docs/embed-va.md -> docs/visualanalytics.md, so the page is served
at /visualanalytics/
- redirect the old /embed-va/ path to the new one
- point the three inbound links (index, filter, deploy-viya) at the new path
- fill in og_title and og_image so link previews carry the page title and a
card image instead of the site defaults
- the object's author often has elevated permissions, not usually an admin
