update main-branch with dev-branch

[birkin]

• Summary: basically, this takes some dev branch improvements, like data-api tests, and lots of new_form branch improvements that were merged into dev -- and adds these changes to main.
• The new_form branch improvements don't affect the existing dev/main form code.
• When attempting to access new-form url endpoints in production, a response like "Not yet ready for production." will be shown.
• The reason for this merge is to allow -- for local-development and for dev-server display -- equivalent citation, item-record, etc. web-pages to be easily compared.

[birkin]

closing to incorporate other changes.