Add Element and SchildiNext app cards with platform info

Add Element desktop client and update SchildiNext to show it's mobile
only

applications.html

@@ -88,7 +88,22 @@
                 <h2>Matrix</h2>
                 <div class="app-gallery">
                     <a
-                        href="https://schildi.chat/"
+                        href="https://element.io/download"
+                        target="_blank"
+                        class="app-card highlighted"
+                    >
+                        <img
+                            src="https://element.io/assets-32bb636196f91ed59d7a49190e26b42c/5ef25c0d30ee3108da4c25e9/5f365d3197194f8c73b00112_logo-mark-primary.svg"
+                            alt="Element icon"
+                            class="app-icon"
+                        />
+                        <div>
+                            <h4>Element</h4>
+                            <p>Desktop only.</p>
+                        </div>
+                    </a>
+                    <a
+                        href="https://schildi.chat/next/"
                         target="_blank"
                         class="app-card highlighted"
                     >
@@ -99,6 +114,7 @@
                         />
                         <div>
                             <h4>SchildiNext</h4>
+                            <p>Mobile only.</p>
                         </div>
                     </a>
                 </div>