Add guidelines for how to cite Jupyter and its subprojects, and which papers are canonical ones for citation

Nobody has claimed this yet.

Jupyter must provide users and readers with guidelines for how to cite Jupyter publications. This will reduce the cognitive load and confusion associated with giving credit to the project (and sub-projects) in scholarly publications.

Jupyter has [authorship guidelines](https://jupyter.org/governance/papers.html) for _writing_ papers, but this doesn't provide guidelines for _citing_ papers. We need to define a lightweight policy for "which paper can make it onto the Jupyter website", as well as implement a place for where they go.

### Next actions

- [ ] Define a policy for deciding whether a paper should be listed on the Jupyter website as a citeable "Jupyter paper"
- [ ] Choose a source-of-truth for where Jupyter's citable papers go
- [ ] Choose a source-of-truth for documenting the guidelines around citations for Jupyter papers
- [ ] Document this in the governance docs, docs.jupyter.org, and jupyter.org
- [ ] Notify all of the subprojects of this policy and encourage them to link to our docs.

### References

- JupyterLab version of this issue: https://github.com/jupyterlab/frontends-team-compass/issues/144

### Known papers in the jupyter ecosystem that might be relevant here

- [Kluyver et al, notebook paper](http://ebooks.iospress.nl/publication/42900)
- [Jupyter et al, Binder 2.0](https://proceedings.scipy.org/articles/Majora-4af1f417-011.pdf)

### Relevant discussions and references for citations in other projects

- [NumPy citations](https://numpy.org/citing-numpy/)
- [SageMath citations](https://wiki.sagemath.org/Publications_using_SageMath)

Start by reviewing the existing authorship guidelines at jupyter.org/governance/papers.html and the citation examples from NumPy and SageMath. Define the paper-listing policy and sources of truth, then document the agreed guidelines in the governance docs, docs.jupyter.org, and jupyter.org and notify the subprojects.

Written by the indexing model from the issue text.