INFRSTR-368 - Updates to the docker directory

[jonespm]

Removed old config that waasn't likely used
Put the Dockerfile at the top level with an updated readme Tested that this mimially works with the current version of Sakai

TODO ideas in a future fix:

• Use docker-compose.yml on the top level to make starting this up easier This would also allow for a persistent volume for MySQL

• Split tomcat from the Dockerfile and have it run separately.

• Verify if we still need the docker-maven-chrome or if we can use the regular maven to build

• Create a .dockerignore (if needed)

• Build from this directory instead of checking out again. I skipped this for now because it would have to clean up before building

• Verify and perform additional cleanup on the container (if possible)

[jonespm]

@ern @csev

I validated that this runs and starts up locally. It cleans up a lot in the docker directory that was outdated while providing a file and working route to build and run from source in Sakai 17.

There's additional work here if people use this but this feels like a minimum viable product.