Update and deprecate tezos_docker_manager.sh

Context

tezos_docker_manager.sh is barely maintained and is often criticized. Writing docker-compose files is usually a better idea than using this script. This MR thus deprecates this script.

Additionally, this MR:

• removes Hangzhounet support from this script;
• updates this script so that it doesn't start the endorser anymore (there is no endorser in Ithaca).

Manually testing the MR

cp scripts/tezos_docker_manager.sh mainnet.sh
./mainnet.sh start
docker logs mainnet_node_1
./mainnet.sh stop

Checklist

• Document the interface of any function added or modified (see the coding guidelines)
• Document any change to the user interface, including configuration parameters (see node configuration)
• Provide automatic testing (see the testing guide).
• For new features and bug fixes, add an item in the appropriate changelog (docs/protocols/alpha.rst for the protocol and the environment, CHANGES.rst at the root of the repository for everything else).
• Select suitable reviewers using the Reviewers field below.
• Select as Assignee the next person who should take action on that MR