remove Conda installation instructions from RTD

[sbenthall]

We no longer support the Conda install

[laurenmarietta]

as someone who stubbornly uses Conda, I'm curious if there's a specific reason why you switched away?

[sbenthall]

It was very complicated explicitly supporting two installation paths.

The .toml package configuration is, to my understanding, the current way it's recommended to write Python packages.

I expect you could install bigbang in a conda environment using pip and it would work just fine.

[MridulS]

Supporting a proper conda release shouldn't be an issue, once we start having wheels releases on pypi (currently only the tar.gz source is uploaded on pypi). I have an interim recipe available https://github.com/conda-forge/staged-recipes/compare/main...MridulS:staged-recipes:bigbangpy_on_conda_forge, just waiting for the next release on pypi. It should be available with conda install -c conda-forge bigbang-py once the recipe is merged on conda-forge.