fix: remove skype image from homepage (#5122)

Author: Luke Wesley-Holley

templates/index.html

@@ -127,7 +127,7 @@ <h2>Showcase to millions</h2>
     <div class="u-fixed-width">
       {{
         image(
-          url="https://assets.ubuntu.com/v1/cfd29985-skype-snap-page.jpg",
+          url="https://assets.ubuntu.com/v1/4c8b43dc-thunderbird-snap-page.png",
           alt="Snap details page",
           width="2216",
           height="1591",