Let's see if this rendering jupyter works

nixos/server/package-configs/forgejo/default.nix

@@ -67,11 +67,19 @@
       markup.jupyter = "
         ENABLED = true;
         FILE_EXTENSIONS = .ipynb
-        RENDER_COMMAND = jupyter nbconvert --stdout --to html --template full 
+        RENDER_COMMAND = ${pkgs.jupyter}/bin/jupyter nbconvert --stdout --to html --template full 
         IS_INPUT_FILE = true
         RENDER_CONTENT_MODE = no-sanitizer
       ";
     };
+    markup.sanitizer.juypter0 = "
+      ; Jupyter chiefly uses divs
+      ELEMENT = div
+      ; we will need access to html classes later
+      ALLOW_ATTR = class
+      ; we don't mind which classes we keep, so let's keep all of them
+      REGEXP =
+    ";
   };
 
   services.nginx = {