Cleanup rosetta-ci docker code

[fkneeland-figure]

Summary

Add documentation for rosetta-cli dockerfile and rename folder for the rosetta-ci dockerfile

Proposal

1. Add documentation in the contrib/rosetta/README.md for the dockerfile in contrib/rosetta/rosetta-cli/Dockerfile
2. Rename contrib/rosetta/node/ to contrib/rosetta/rosetta-ci to make the image that is created with it

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