chore: update sponsors list in index page

Author: jcbrand

index.html

@@ -259,11 +259,12 @@ <h2 style="text-align: center">Professional support and custom development 👷<
         <div class="container mx-auto w-50">
             <div class="sponsors">
                 <h2>Special thanks to our sponsors</h2>
-                <ul class="list-unstyled row row-cols-1 row-cols-lg-2 row-cols-xl-4 justify-content-center align-items-center">
-                    <li class="col text-center"><a href="https://bairesdev.com/sponsoring-open-source-projects/?utm_source=conversejs" target="_blank" rel="noopener"><img class="img-fluid" style="max-width: 13em" src="/media/logos/BairesDev_logo-orange.png" alt="BairesDev"></a></li>
-                    <li class="col text-center"><a href="https://blokt.com?utm_source=conversejs" target="_blank" rel="noopener"><img class="img-fluid" style="max-width: 12em" src="/logo/blokt.png" alt="Blokt Crypto & Privacy"></a></li>
-                    <li class="col text-center"><a href="https://www.keycdn.com?utm_source=conversejs" target="_blank" rel="noopener"><img class="img-fluid" style="max-height: 3em" src="/logo/keycdn.svg" alt="KeyCDN"></a></li>
-                    <li class="col text-center"><a href="https://weblate.org?utm_source=conversejs" target="_blank" rel="noopener"><img class="img-fluid" style="max-height: 2.6em" src="/logo/weblate-button.svg" alt="Weblate"></a></li>
+                <ul class="list-unstyled row row-cols-1 justify-content-center align-items-center">
+                    <li class="col text-center pt-3"><a href="https://bairesdev.com/sponsoring-open-source-projects/?utm_source=conversejs" target="_blank" rel="noopener"><img class="img-fluid" style="max-width: 13em" src="/media/logos/BairesDev_logo-orange.png" alt="BairesDev"></a></li>
+                    <li class="col text-center pt-3"><a href="https://blokt.com?utm_source=conversejs" target="_blank" rel="noopener"><img class="img-fluid" style="max-width: 12em" src="/logo/blokt.png" alt="Blokt Crypto & Privacy"></a></li>
+                    <li class="col text-center pt-3"><a href="https://litslink.com/?utm_source=conversejs" target="_blank" rel="noopener"><img class="img-fluid" style="max-width: 13em" src="/media/logos/litslink-light.svg" alt="LITSLINK software development"></a></li>
+                    <li class="col text-center pt-3"><a href="https://www.keycdn.com?utm_source=conversejs" target="_blank" rel="noopener"><img class="img-fluid" style="max-height: 3em" src="/logo/keycdn.svg" alt="KeyCDN"></a></li>
+                    <li class="col text-center pt-3"><a href="https://weblate.org?utm_source=conversejs" target="_blank" rel="noopener"><img class="img-fluid" style="max-height: 2.6em" src="/logo/weblate-button.svg" alt="Weblate"></a></li>
                 </ul>
             </div>