Conditionally include API section in documentation

🐞 **Problem**
There is a huge bottle neck when building the API documentation section in the docs. If possible, this section should be skipped by using the Jinja strategy we have followed in other repositories.

Start by locating the documentation build configuration and the existing Jinja strategy used for conditional sections. Check how the API documentation section is assembled, then verify that it can be skipped during builds and that the resulting documentation remains correct when included.

Written by the indexing model from the issue text.