fix: allow start attribute on ordered lists (SafeMarkdown) (#6820)

Co-authored-by: Michael Genson <71845777+michael-genson@users.noreply.github.com>

Author: p0lycarpio

frontend/components/global/SafeMarkdown.vue

@@ -31,7 +31,7 @@ export default defineNuxtComponent({
         ],
         ALLOWED_ATTR: [
           "href", "src", "alt", "height", "width", "class", "allow", "title", "allowfullscreen", "frameborder",
-          "scrolling", "cite", "datetime", "name", "abbr", "target", "border",
+          "scrolling", "cite", "datetime", "name", "abbr", "target", "border", "start",
         ],
       });