Update the publication feeds

scipost/templates/feeds/latest_publications_description.html

-{{ obj.title }}
+{{ obj.citation }}

scipost/templates/feeds/latest_publications_title.html

-{{obj.in_issue.in_volume.in_journal.abbreviation_citation}} {{obj.in_issue.in_volume.number}}, {{obj.get_paper_nr}} ({{obj.publication_date|date:'Y'}}), by  {{ obj.author_list }}
+{{obj.title}}, by {{ obj.author_list }}