add logic to make citations re-usable

[rvhonorato]

This PR adds a framework to make citations re-usable across the pages.

Currently a lot of things are duplicated in the many different pages, this is not necessary. Given that the website is built with jekyll and uses liquid as the HTML render, you can define either static or dynamic blocks of content and include them in the pages.

In this PR I've added the logic for a citation - granted that this is not something that changes often, but you can apply the same logic to a "haddock_intro.md" and then just include them in the pages instead of copy and paste every time.

How it works

• _data/publications.yml holds the data for the publication

haddock24:
  authors: "R.V. Honorato, M.E. Trellet, B. Jiménez-García, J.J. Schaarschmidt, M. Giulini, V. Reys, P.I. Koukos, J.P.G.L.M. Rodrigues, E. Karaca, G.C.P. van Zundert, J. Roel-Touris, C.W. van Noort, Z. Jandová, A.S.J. Melquiond and **A.M.J.J. Bonvin**"
  title: "The HADDOCK2.4 web server: A leap forward in integrative modelling of biomolecular complexes"
  url: "https://www.nature.com/articles/s41596-024-01011-0"
  journal: Nature Protoc
  details: "19, 3219–3241"
  doi: "10.1038/s41596-024-01011-0"
  year: 2024

• _includes/paper_citation.html handles the formatting of the data:

{% assign paper = site.data.papers[include.key] %}
<!-- Define how the citation should be formatted -->
* {{ paper.authors }} [{{ paper.title }}]({{ paper.url }}). _{{ paper.journal
}}_, {{ paper.details }} DOI: [{{ paper.doi }}](https://doi.org/{{ paper.doi }})
({{ paper.year }})

• Inside the .md files you then simply:

{% include paper_citation.html key="haddock24" %}

This will make sure there is a single-source of information instead of having to manually check a lot of them.

It would be good if further changes follow this pipeline to reduce the maintenance cost of this site.

---

Note, to have a re-usable block such as haddock_intro it would be defined inside _includes/haddock_intro.md and then used in the page as {% include haddock_intro.md %}

[amjjbonvin]

Very nice solution @rvhonorato