docs: Remove an unused setting from docs/conf.py

This is now triggering warnings saying that:

    WARNING: The config value `viewcode_import' has type `bool';
             expected `NoneType'.

The comment says that we were trying to prevent the `viewcode` extension
from generating HTML for the standard library `datetime` module, but
even with this setting removed it doesn't do that. This may just be
a holdover from some long ago version of Sphinx, but it no longer seems
to be necessary or useful.

Signed-off-by: Matt Wozniski <[email protected]>

Author: godlygeek

docs/conf.py

@@ -264,9 +264,6 @@
 # Example configuration for intersphinx: refer to the Python standard library.
 intersphinx_mapping = {"python": ("https://docs.python.org/3", None)}
 
-# Don't highlight the code for the Python standard library datetime module.
-viewcode_import = False
-
 # Don't automatically infer types from type annotations.
 autodoc_typehints = "none"