Use the respec-w3c profile

The `w3c-common` profile was no longer updated.
See w3c/respec#2838 for details.

index.html

@@ -6,7 +6,7 @@
 
 <link rel="stylesheet" href="local.css" />
 
-<script async class="remove" src="https://www.w3.org/Tools/respec/respec-w3c-common"></script>
+<script async class="remove" src="https://www.w3.org/Tools/respec/respec-w3c"></script>
 <script defer src="script.js"></script>
 
 <script class="remove">