bibtex bibliography should be footbibliography

[lilyminium]

Expected behavior

If you want a local bibliography in similarity.py, the correct directives to use are actually footbibliography and footcite. cite and bibliography are to be used for global bibliographies, like a separate references page.

Making this change allowed me to build docs as below:

[lilyminium]

It is still weird that it goes:

1. Function reference heading
2. Bibliography
3. Actual function reference

But I presume that has something to do with the layout of the module docstring:

Function reference
==================

.. All functions are included via automodule :members:.

.. rubric:: References

.. footbibliography::

@ianmkenney you may need to manually .. autosummary there if you want it in a more logical order.

Tbh a global bibliography might make more sense.