[Docs] Airbyte OSS endpoints

### Page URL

https://reference.airbyte.com/

### Description

It would be nice to have explicitly provided endpoints on Airbyte OSS. At this moment there is only information for Airbyte Cloud API

https://reference.airbyte.com/reference/listconnections


It would be nice to have something like this


You really need to know Airbyte for longer to know about this https://reference.airbyte.com/reference/standalone-server-deprecation-and-migration-to-airbyte-server

There were multiple threads on Slack related to that
https://airbytehq.slack.com/archives/C021JANJ6TY/p1743585670457579?thread_ts=1743583807.664429&cid=C021JANJ6TY
https://airbytehq.slack.com/archives/C021JANJ6TY/p1743494918156179?thread_ts=1743475127.123069&cid=C021JANJ6TY
https://airbytehq.slack.com/archives/C021JANJ6TY/p1725940769684639?thread_ts=1725911347.103019&cid=C021JANJ6TY
https://airbytehq.slack.com/archives/C021JANJ6TY/p1723154846322879?thread_ts=1723153431.414849&cid=C021JANJ6TY
https://airbytehq.slack.com/archives/C021JANJ6TY/p1723011954106879?thread_ts=1723009957.932139&cid=C021JANJ6TY
https://airbytehq.slack.com/archives/C021JANJ6TY/p1719932438700789?thread_ts=1719931599.230069&cid=C021JANJ6TY