Form management API should be documented

[rl1987]

API reference at OpnForm developer portal (https://docs.opnform.com/api-reference/introduction) does not document the API that frontend uses for operations on forms (creation, deletion, etc.). As automation developer I would like to have pages similar to these:

https://apidocs.form.io/?version=latest#d43fc691-1008-a1a7-eee8-eb80658922fa
https://api.jotform.com/docs/#post-forms

[JhumanJ]

We'll add this at some point. The current API token that users can created a limited to external connections such as Zapier, and the internal API is private (and undocumented for now).