Add how-to-cite to portal

[jukent]

Do we want how to cite in the long page or on a separate page?

I want to add this to the footer as well, but I think that is done in the sphinx-pythia-theme repo. I need to do more investigation on the cite infrastructure, but this is a good first step.

Please give your review on the text as well as location.

Related to #306

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[jukent]

Which section of the footer would it best fit in? I'm leaning towards under "About"

[jukent]

Similarly, do we want this in the top nav bar?

[jukent]

Looks like I'd have to change it in the portal, foundations, and cookbook gallery footer-menu: https://github.com/ProjectPythia/projectpythia.github.io/blob/main/portal/_templates/footer-menu.html https://github.com/ProjectPythia/pythia-foundations/blob/main/_templates/footer-menu.html https://github.com/ProjectPythia/cookbook-gallery/blob/main/site/_templates/footer-menu.html

Looking at this, should we remove the discussions and replace with a link to Pangeo discourse?

[jukent]

See https://github.com/ProjectPythia/cookbook-gallery/pull/170 and https://github.com/ProjectPythia/pythia-foundations/pull/418 for making these changes in Foundations and Cookbooks

[brian-rose]

Opened #349 to track the newly broken links