wcag.json: Strip role="heading" and aria-level from content (#4738)

Fixes #4725.

This causes no change to the build's HTML output; its only impact is to
remove these two attributes from note markers in `wcag.json` output.

Author: kfranqueiro

11ty/guidelines.ts

@@ -266,6 +266,10 @@ const loadRemoteGuidelines = async (version: WcagVersion, stripRespec = true) =>
   // so that names parse consistently
   $("bdi").remove();
 
+  // Remove role="heading" + aria-level from notes/issues, as they cause more harm than good
+  // (especially in context of content reuse via wcag.json export)
+  $("[role='note'] .marker").removeAttr("role").removeAttr("aria-level");
+
   if (!stripRespec) return $;
 
   // Re-collapse definition links and notes, to be processed by this build system