create explicit docker network

[mathematicalmichael]

problem:

if the repo is renamed (or the folder into which it is cloned is renamed), docker-compose will change the name of the default network that is created and functionally break make serve.

solution:

• make network as a dependency to create an explicit external network and reference it in the docker-compose file
• understand how default network can be renamed to something within docker-compose.yml (i.e., avoid external network with Makefile) and give it an explicit name.