Add iconify credit

Author: smnandre

ux.symfony.com/templates/components/Icon/IconSearch.html.twig

@@ -33,6 +33,16 @@
                         class="form-control IconSearch__Input"
                         id="IconSearch-Query"
                     >
+                    <p style="
+                        position: absolute;
+                        right: .75rem;
+                        font-size: .7rem;
+                        font-stretch: semi-condensed;
+                        opacity: .5;
+                        margin: 0;
+                        top: 50%;
+                        transform: translateY(-50%);
+                    ">Powered by <a href="https://iconify.design/">iconify<span>.</span>design</a></p>
                 </div>
 
                 <div class="d-flex flex-shrink-0">