add more header ids for usage in links

static/releases.html

@@ -33,7 +33,7 @@
             </ul>
         </nav>
         <div id="content">
-            <h1>Releases</h1>
+            <h1 id="releases">Releases</h1>
             <p>These releases are available as both tags in the source code repositories and
             official builds.</p>
             <p>The factory images are used for the initial installation and can be verified with
@@ -62,7 +62,7 @@
             <noscript><strong>JavaScript is required to fetch the current list of releases from
             the update server.</strong></noscript>
 
-            <h2>Stable channel</h2>
+            <h2 id="stable-channel">Stable channel</h2>
 
             <div id="crosshatch-stable">
                 <h3>Pixel 3 XL</h3>
@@ -152,7 +152,7 @@
                 <a>OTA update url loading...</a>
             </div>
 
-            <h2>Changelog</h2>
+            <h2 id="changelog">Changelog</h2>
 
             <p>List of tagged releases. Snapshot releases without tags such as early releases of
             the project and early device support releases are not listed.</p>