- Contributors may run `make venv` and install requirements.txt without modifying host OS
- Innermost `requirements.txt`, 2 dependencies, moved to uppermost requirements.txt
- Adds `venv` to .gitignore in case contributors/developer forget to remove.
- Reverts source/conf.py to original.
- Replaces python command with python3 in innermost _python/Makefile
Signed-off-by: Michael Vincerra <michael.vincerra@intel.com>
Makefile is rebuild with simple targets to point to source directory.
Now the users can use "make" or "make html" at root repo path and the
html documentation is built.
