mkRedundantOption: try using html formatting to get around indentation requirement

flake.nix

@@ -59,8 +59,15 @@
         ${attrs.description}
 
 
-        !!! warning
+        <div class="admonition-warning">
+          <p class="admonition-title">
+            ::before
+            Redundant
+          </p>
+          <p>
             ${mkRedundantOptionDescription name value}
+          </p>
+        </div>
         '';
     };
   };