Draft: source: Store the intersphinx objects in the repo

This allows to build the documentation offline.

The files were downloaded via

grep -A10 intersphinx_mapping conf.py | grep https | cut -f 4 -d """ | sed -e "s/$//objects.inv/"

and then

wcurl https://itango.readthedocs.io/en/latest//objects.inv -o itango-objects.inv wcurl https://pytango.readthedocs.io/en/latest//objects.inv -o pytango-objects.inv wcurl https://docs.python.org/3/objects.inv -o python-objects.inv wcurl https://jive.readthedocs.io/en/latest//objects.inv -o jive-objects.inv wcurl https://tango-astor.readthedocs.io/en/latest//objects.inv -o tango-astor-objects.inv wcurl https://tangoatk.readthedocs.io/en/latest//objects.inv -o tangoatk-objects.inv wcurl https://taranta.readthedocs.io/en/latest//objects.inv -o taranta-objects.inv wcurl https://rfc.readthedocs.io/en/latest//objects.inv -o tango-rfc-objects.inv