Triage ODK wiki for possible additions to Docs

A lot of these are dev-focused, but it would be worthwhile to sift through to be sure.

https://github.com/opendatakit/opendatakit/wiki

Start by reviewing the ODK wiki at the linked URL and comparing its pages with the current documentation in this repository. Record which wiki material is missing from Docs and identify specific additions or exclusions; the triage is complete when the wiki has been systematically reviewed and the resulting candidates are documented.

Written by the indexing model from the issue text.