[chores] Added fetchpriority to images in index.html

Author: nemesifier

content/pages/index.html

@@ -63,6 +63,7 @@ <h1 class="title is-spaced is-size-3-mobile">
           alt="OpenWISP Web Dashboard"
           class="screenshot main"
           height="677"
+          fetchpriority="high"
         />
       </section>
 
@@ -287,6 +288,7 @@ <h3 class="mb-2">Reliable Support</h3>
             alt="Network Globe"
             width="475"
             height="379"
+            fetchpriority="low"
           />
         </div>
       </div>