* Get rid of `make` in favor of `poe`
This moves the tasks that were previously in Makefile, into
pyproject.toml (with all the other config)
This is also more inclusive of Windows developers since they only need
Python, and no longer have to install make separately.
* udpate docs
* don't make code blocks also links
* Improve GitHub PR Template
* suggest running commands with `poetry run ...`
pyflakes here is given only certain subdirectories because `.` will try and run across all packages installed in the virtual environment, if the virtual environment is within the project's root folder (which is my common practice).
