rm intersphinx_mapping to bus_device pkg

Author: 2bndy5

conf.py

@@ -414,7 +414,6 @@
 
 # Example configuration for intersphinx: refer to the Python standard library.
 intersphinx_mapping = {"cpython": ('https://docs.python.org/3/', None),
-                       "bus_device": ('https://circuitpython.readthedocs.io/projects/busdevice/en/latest/', None),
                        "register": ('https://circuitpython.readthedocs.io/projects/register/en/latest/', None)}
 
 # Adapted from sphinxcontrib-redirects