remove Makefile in favor of python commands

This PR removes the Makefile in favor of CLI commands. We can see all the available CLI commands by running nbprocess_help:

> nbprocess_help

nbprocess_bump_version          Increment version in `settings.py` by one
nbprocess_clean                 Clean all notebooks in `fname` to avoid merge conflicts
nbprocess_conda                 Create and upload a conda package.
nbprocess_create_config         Creates a new config file for `lib_name` and `user` and saves it.
nbprocess_deploy                Deploy docs to GitHub Pages.
nbprocess_docs                  Generate the docs.
nbprocess_export                Export notebooks in `path` to python modules
nbprocess_filter                A notebook filter for quarto
nbprocess_fix                   Create working notebook from conflicted notebook `nbname`
nbprocess_ghp_deploy            Deploy docs in doc_path from settings.ini to GitHub Pages
nbprocess_help                  Show help for all console scripts
nbprocess_install               Install quarto and the current library.
nbprocess_install_hooks         Install git hooks to clean/trust notebooks automatically
nbprocess_install_quarto        Installs latest quarto on mac or linux.  Prints instructions for Windows.
nbprocess_migrate_directives     Convert all directives in `fname` from v1 to v2.
nbprocess_new                   Create a new project from the current git repo
nbprocess_prepare               Export notebooks to python modules, test code and clean notebooks.
nbprocess_preview               Start a local docs webserver.
nbprocess_pypi                  Create and upload python package to pypi.
nbprocess_quarto                Create quarto docs and README.md
nbprocess_release               Release both conda and pypi packages.
nbprocess_sidebar               Create sidebar.yml
nbprocess_test                  Test in parallel the notebooks matching `fname`, passing along `flags`
nbprocess_trust                 Trust notebooks matching `fname`
nbprocess_update                Propagates any change in the modules matching `fname` to the notebooks that created them

@muellerzr @jph00 @Isaac-Flath

fastai / nbprocess-old

remove Makefile in favor of python commands #86