Update examples directory to make starting with MPhys easier

[kejacobson]

• Change the examples in the public repo to only be open source geometries and codes. Examples in the repo should be runnable from the University of Michigan's public docker image. We will need to add TACS, FUNtoFEM and OpenAeroStruct to this image
• Move VLM examples to OpenAeroStruct
• add wget scripts for large mesh files or store all case files in a single location.
• provide instructions for converting docker image to singularity container for HPC users.
• Add CI to regularly (biweekly) run some set of examples using the docker image