Ofiber

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* add functions for far-field irradiance (thanks matt8s)
* improve calc of b for cylindrical step fibers for large V
* add new notebook for far-field irradiance
* enable use of arrays in `cylinder_step.LP_mode_value()`

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* fix long-description for pypi

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* better handling of propagation factor b
* add import boilerplate needed for Jupyterlite
* Makefile packaging for Jupyterlite file
* use __version__ and other dunders
* flake8 now passes
* fix various docstrings
* readthedocs fixes
* ruff support
* add erbium fiber doc
* clean up notebooks
* add copyright stuff
* add .github actions
* update badges
* conda support

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* create pure python packages
* include wheel file
* package as python3 only

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* add colab and binder badges
* improve docs
* rename dispersion api
* start using more descriptive names in notebooks

Adding more documentation and making it easier to find.

I also renamed some routines in the API.