views/modals/intro.html: tease WWT 2022 launch in welcome popup

views/modals/intro.html

@@ -25,15 +25,28 @@
           World<span style="color:#6ba9e6">Wide Telescope</span>
         </h1>
 
-        <h3 localize="Welcome to AAS WorldWide Telescope"></h3>
+        <div class="clear"></div>
+
+        <p style="margin-top: 20px;">Welcome to AAS WorldWide Telescope!</p>
 
         <ul>
           <li localize="Move around the sky by clicking and dragging."></li>
           <li localize="Zoom in/out by scrolling the mouse wheel or pressing +/-."></li>
           <li localize="Right-click in the view to display the Finder Scope for more information."></li>
-          <li localize="Menu Tabs (“Explore”, “Guided Tours”, etc.) have two parts. Click the tab’s top to open a pane; click the tab’s bottom to open a submenu."></li>
+          <li localize="Menu tabs (“Explore”, “Guided Tours”, etc.) have two parts. Click the tab’s top to open a pane; click the tab’s bottom to open a submenu."></li>
         </ul>
 
+        <h3 localize="WWT 2022: Coming February 15th!"></h3>
+
+        <p>The latest version of AAS WorldWide Telescope — WWT 2022 — will
+        launch on February 15th! Join us for the launch event on YouTube at 1
+        PM, US Eastern time. Click through to watch the <b>epic</b> trailer and
+        sign up for a reminder.</p>
+
+        <p class="text-center">
+          <a class="btn" href="https://youtu.be/U7PIAKCZHYM" target="_blank">Go to the Launch Event</a>
+        </p>
+
         <h3 localize="Help Support WWT!"></h3>
 
         <p>The non-profit <a href="https://aas.org/" target="_blank">American Astronomical