Make all citations consistent and dwell at a single place

[jhlegarreta]

Citations across the website should be made consistent and dwell at a single place/source file to avoid duplicating information, and potentially introducing typos.

For, example the Atlases page (source) contains references that also live in the Citations page (source), or references that live in the BibTeX list, e.g. norton2017slicerdmri.

Not sure if converting BibTeX to CFF could allow us to be display it more easily (?), and drop the JS bib-list.js dependency (?). BibTeX should still be the primary format.

Related to issues #1 and #2.