Add "Further reading" sections in documentation

[TorkelE]

For several documentation pages that explain how to perform certain analysis (bifurcation diagrams, performing Gillespie simulations), would it make sense to have a further reading section at the end, providing references to articles/text books? That way, someone interested in the topic can quickly find a source of in-depth reading. Alternatively, someone not familiar with the topic might a first place to read up on it.

[TorkelE]

Similarly, maybe some sections maybe should have a "Citation" section with papers people should cite if they use that functionality? E.g. https://link.springer.com/chapter/10.1007/978-3-319-96418-8_54 for https://docs.sciml.ai/Catalyst/stable/catalyst_applications/homotopy_continuation/.

[TorkelE]

(for certain doc pages, similarily exist, but called "References". We could also use that name for the proposed section)

[TorkelE]

This kinds of sections (in references) have now been added where suitable.