Add .rst to mimetypes

>>> import mimetypes >>> mimetypes.guess_type("README.rst", strict=False) (None, None)

In the python:3.11 Docker image, we get a vanity type:

>>> mimetypes.guess_type("README.rst", strict=False) ('text/prs.fallenstein.rst', None)

I think most people would expect text/x-rst. Even better would be to get it registered!

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