Links to outdated api documentation

[jh-RLI]

Description of the issue

There are a few links in the academy that still point to the old api documentation https://oep-data-interface.readthedocs.io/en/latest/index.html. We should remove the link, only Martin has access to the Read the Docs project. I can't set up a redirect to the new page.

Ideas of solution

We now use https://openenergyplatform.github.io/oeplatform/ to develop/provide the oeplatform docs. The "work in progress" api docs are here, they will be complete by the end of september.

Workflow checklist

• [x] I am aware of the workflow in CONTRIBUTING.md

[han-f]

I have updated the links in all three documents to https://openenergyplatform.github.io/oeplatform/install-and-documentation/oeplatform-code/web-api/oedb-rest-api/ for now.

As it indicates to be work in progress I think this is fine for now, OK? @jh-RLI @wingechr