docs: dont generate modules.rst

[chrisimcevoy]

I found the structure of the docs very confusing.

The confusing, old way

We had an index.rst that included modules.rst in its contents.

That modules.rst was a table of contents of python packages, of which there is only one (pyoda_time).

From there you could finally click into the api docs for the package...

The confusion arose from the use of the text "pyoda_time", with multiple, subtly different meanings in different contexts - even within the same html file.

The less confusing, new way

We tell sphinx-apidoc not to generate a table of contents file at all, so no more modules.rst.

We just link directly from the index.rst to the pyoda_time.rst, cutting out the middleman.

This is much less confusing.

index.html:

pyoda_time.html:

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