Add commented citation url and pdf-url placeholders

To be set at acceptance with the published repository name; pdf-url
produces the citation_pdf_url meta tag used by Google Scholar.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

Author: jchiquet

_quarto.yml

@@ -41,6 +41,9 @@ citation:
   container-title: "Computo"
   issn: "2824-7795"
   doi: "10.5072/computo.0000" # placeholder DOI (10.5072 is the official DOI test prefix), replace once assigned
+  # set at acceptance, with the published repository name (used by Google Scholar):
+  # url: "https://computo-journal.org/published-YYYYMM-name/"
+  # pdf-url: "https://computo-journal.org/published-YYYYMM-name/main.pdf"
 format:
   computo-html: default
   computo-pdf: default