fix: clean up some language regarding citations

[jsstevenson]

a few possible changes -- let me know if they need to go through additional channels first:

• Fix wording on the Citation policy page, which refers to a "Cite" section on the ontology detail page (the header is actually "Publications")
• add a linkable anchor to the "publications" header on an ontology's detail page, so that the citation policy page can link to it directly
• Alter wording on the big "list of publications" page. When I first saw it, I assumed it was totally ad-hoc and wanted to instead generate it from publication annotations from the ontology metadata -- then I looked at the code and realized that's what was already happening. So, I thought it might be helpful to give a brief explanation of where the list comes from.