explain how to move DVC-files around

[dashohoxha]

I think that it is not explained in the docs how to move DVC-files around. For example this one does not work: mv my_file.dvc dvc_links/my_file.dvc

Context: https://discuss.dvc.org/t/how-to-move-dvc-files/205
Related: #230

[dashohoxha]

Working on this:

• https://github.com/dashohoxha/katacoda-dvc-scenarios/commit/8d8d86fa8e22407fd61a6eef0a121f2afba9d8a9
• https://github.com/dashohoxha/katacoda-dvc-scenarios/commit/39e052ca1b9d62896aec554b09fa7b51c27ce8cc

[dashohoxha]

This lesson explains it: https://katacoda.com/dvc/courses/basics/data