Issue #617 attempt to fix detection of "internal" links with link-ext…

…ernal-filter config

_quarto.yml

@@ -341,7 +341,7 @@ format:
       file: custom.html
     link-external-icon: true
     link-external-newwindow: true
-    link-external-filter: '^(?:http:|https:)\/\/documentation.*dataspace.copernicus\/custom'
+    link-external-filter: '^(?:http:|https:)\/\/(documentation.dataspace.copernicus.eu|eu-cdse.github.io)\/'
 bread-crumbs: true
 ipynb-filters:
   - notebook_filter.py