Remove weird duplicate Layout section

No idea how that appeared.

index.html

@@ -2290,12 +2290,6 @@ <h4>Disposition of Features and Extensions</h4>
       </table>
     </section>
 
-      <section>
-        <h4>Layout</h4>
-        <p>This specification does not put additional constraints on the layout and rendering <a>features</a> defined in [[!ttml-imsc1.2]].</p>
-        <div class="note">Layout of the paragraphs may rely on the default TTML region (i.e. if no <code>layout</code> is used in the <code>head</code> element) or may be explicit by the use of the <code>region</code> attribute, if a <code>region</code> element is defined in a <code>layout</code> element in the <code>head</code> element.</div>
-      </section>  <!-- Layout -->
-
       <section id="content-profile">
         <h4>DAPT Content Profile</h4>
         <p>The DAPT Content Profile expresses the conformance requirements of <a>DAPT Scripts</a>