Docs: Remove aiida.manage.configuration.load_documentation_profile

This was necessary when Django backends were still supported, but since
its removal in AiiDA v2.0 just loading the ORM no longer actually needs
to connect to a database. In principle, the documentation no longer
needs a profile whatsoever, except for `aiida-quantumespresso` the
AutoAPI still needs it because in loading the specifications of certain
`Process` classes, a profile is loaded. So the docs `conf.py` now loads
an empty dummy profile for this purpose.

docs/source/conf.py

@@ -10,17 +10,15 @@
 import pathlib
 import time
 
-# Load the dummy profile even if we are running locally, this way the documentation will succeed even if the current
-# default profile of the AiiDA installation does not use a Django backend.
-from aiida.manage.configuration import load_documentation_profile
+from aiida.manage.configuration import Profile, load_profile
+
+load_profile(Profile('docs', {'process_control': {}, 'storage': {}}))
 
 # If extensions (or modules to document with autodoc) are in another directory,
 # add these directories to sys.path here. If the directory is relative to the
 # documentation root, use os.path.abspath to make it absolute, like shown here.
 import aiida_vibroscopy
 
-load_documentation_profile()
-
 # -- Project information -----------------------------------------------------
 
 project = 'aiida-vibroscopy'