Update install instructions, and move from README to readthedocs #105
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I think the README was getting a bit long, and the installation instructions missing a few updates (no need to install in recent CMSSW versions, install from source in case of ABI problems), so I restructured that part a bit, and moved it to its own page of the sphinx documentation (ideally the same should be done for a "creating corrections" page, but I'm not as familiar with that).
I also copied the upper part of the README to the introduction page there, but I'm not sure if it needs to stay in both.
To avoid reformatting (and because I think it lowers the threshold to contribute) I added myst-parser and used markdown for these two pages.
Please let me know if you agree, or if anything needs to be changed.