Correct and update the Makefile

[sugatoray]

The Makefile has a few problems, and also it is not well documented and well organized. If properly worked on, it could simplify a lot of steps.

1. .PHONY declarations are either nonexistent or the commands that should have been updated, are not there.
2. Parametrization of the make commands with variables could lead to lesser human-error. This will require some reorganization.
3. Add make commands that can directly run several steps such as flake, black, type, clean, etc.
4. Add doctest checker interrogate to the workflow. For now set the requirement at 0% to pass interrogate runs.
   • https://github.com/econchick/interrogate
5. Add documentation to various sections to clearly explain what they are for.