Document API #18
Description
In particular, need to make more visible documentation regarding editing Variant and Relation objects via API. Currently a lot of documentation exists in the docstrings for Serializers and/or ViewSets.
It's possibly best to have this documentation on the site itself, but not as "main page" material (i.e. in a "Developer" or "API" section). The main page should assume/encourage users to be managing accounts which are being used for programmatic tag submission (via a client-side JS widget, or delegated to a third party via OAuth2). API docs are only intended for potential developers creating new client-side JS widgets or third party apps (i.e. other apps like Genevieve).