assign technique id

Author: Michael Cooper

techniques/general/Gxxx-highly-visible-focus-indicator.html renamed to techniques/general/G223.html

@@ -80,7 +80,7 @@ <h3>Sufficient Techniques</h3>
 
          <ol>
             <li>
-                <a href="../../techniques/general/Gxxx-highly-visible-focus-indicator.html" class="general">Using an author-supplied, highly visible focus indicator</a>
+                <a href="../../techniques/general/G223" class="general">Using an author-supplied, highly visible focus indicator</a>
             </li>
             <li>
                <a href="../../techniques/css/C40">Creating a two-color focus indicator to ensure sufficient contrast (@@@ check it meets this SC)</a>