Removed the completions and edit endpoints which have been deprec…

…ated by OpenAI. Feeds using these endpoints will be automatically converted to the `chat/completions` endpoint.

* Removed `completions` `edits` endpoints and transform their feeds to `chat/completions`

* fix lint

* Updated to make "Advanced Settings: Chat Completions" collapsiable and collapsed by default.

* Feedback fixes

* Feedback fixes

* Fix phpsc

* Feedback fixes

* Fix phpsc

---------

Co-authored-by: David Smith <[email protected]>