Update workflows README.md

**Description of the tutorial or documentation**
The workflows directory has its own README.md, which currently describes the procedure of building and deploying a Docker container. This should be updated (or removed), since MDMC has been modified to run natively instead of using a container.

**Additional details**
N/A

Start with workflows/README.md and inspect the workflows directory to compare its Docker build-and-deploy instructions with the current native execution approach. Update the README to describe the native procedure, or remove it if it is no longer useful; done means it no longer documents an obsolete container-based process.

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