Dependencies are now implemented, and the docs should be clear about the
format of the keys and values.
Noticed while working on GothenburgBitFactory/tw.org#212.
In #3118 @ryneeverett mentioned that "key" suggests that this is a
secret, when in truth it's just a user identifier. So "ID" is a better
word for it than "key".
- update CI branch filters so workflows actually run on merge
- update CI docs deployment target
- update links
- fix typos
- remove references to `ta` cli which was removed
- remove build-docs.sh script which duplicates publish-docs.yml workflow
