clean up requirements.txt

[apjanco]

There are many libraries in requirements.txt that were probably included in a pip freeze that are not directly related to the code. They should be removed. The current list of dependencies is too long and could lead to hell.

Installing collected packages: numpy, entrypoints, MarkupSafe, jinja2, pyrsistent, attrs, zipp, importlib-resources, jsonschema, pytz, six, python-dateutil, pandas, toolz, altair, certifi, chardet, h11, sniffio, httpcore, rfc3986, httpx, idna, pickleshare, wcwidth, prompt-toolkit, traitlets, backcall, parso, jedi, decorator, matplotlib-inline, ptyprocess, pexpect, pygments, ipython, jupyter-core, ipython-genutils, nbformat, nest-asyncio, tornado, pyzmq, jupyter-client, debugpy, ipykernel, jupyterlab-widgets, terminado, Send2Trash, prometheus-client, nbclient, pyparsing, packaging, webencodings, bleach, testpath, jupyterlab-pygments, defusedxml, mistune, pandocfilters, nbconvert, pycparser, cffi, argon2-cffi-bindings, argon2-cffi, notebook, widgetsnbextension, ipywidgets, joblib, lxml, more-itertools, jsonpickle, webcolors, pillow, cycler, fonttools, kiwisolver, matplotlib, music21, networkx, pyvis, textdistance, xlsxwriter