Redirect api.mongodb.com/python to pymongo.readthedocs.io

Now that we use pymongo.readthedocs.io (PYTHON-1981) to host our documentation we should figure out what we want to do for the old api docs site. We could continue to host the full docs on both sites or we could redirect users to the corresponding pymongo.readthedocs.io page. For example:

• https://api.mongodb.com/python/3.10.0/ would redirect to https://pymongo.readthedocs.io/en/3.10.0/
• https://api.mongodb.com/python/current would redirect to https://pymongo.readthedocs.io/en/stable