[doc][conf] Remove extra-intersphinx handling

The feature is not used in this package.

doc/conf.py

@@ -12,7 +12,6 @@ import sphinx_rtd_theme
 
 # For inter-documentation mapping:
 from bob.extension.utils import link_documentation
-from bob.extension.utils import load_requirements
 
 # -- General configuration -----------------------------------------------------
 
@@ -241,12 +240,6 @@ if "BOB_DOCUMENTATION_SERVER" not in os.environ:
         "BOB_DOCUMENTATION_SERVER"
     ] = "https://www.idiap.ch/software/beat/docs/beat/%(name)s/%(version)s/|https://www.idiap.ch/software/beat/docs/beat/%(name)s/master/"
 
-sphinx_requirements = "extra-intersphinx.txt"
-if os.path.exists(sphinx_requirements):
-    intersphinx_mapping = link_documentation(
-        additional_packages=["python", "numpy"] + load_requirements(sphinx_requirements)
-    )
-else:
 intersphinx_mapping = link_documentation()
 
 # Adds simplejson, pyzmq links