[dev] Structure branches for release.

[romesco]

We intend to release versions of singular project packages - think hydra-configs-torch or hydra-configs-torchvision via release branches that get tagged for upload to PyPI.

This enables users to get the exact version they need by specifying:
pip install hydra-configs-torch==1.6 or pip install hydra-configs-torch==1.7.

Master/the top level will remain the metapackage hydra-torch and will include the most uptodate configs for each package. For example, at present, if the user wrote:
pip install hydra-torch,
they would end up with the packages:

hydra-configs-torch==1.7
hydra-configs-torchvision==0.8

[romesco]

Open question: should metapackage install from PyPI or from git directly?

[omry]

definitely pypi in my opinion.

[romesco]

Update OVERVIEW.md with information on branch/tag convention when this is settled.