rm survey banner (#8298)

Author: lyndaidaii

src/NuGetGallery/Views/Shared/Gallery/Header.cshtml

@@ -22,16 +22,6 @@
     </div>
 }
 
-<div class="container-fluid banner banner-info text-center">
-    <div class="row">
-        <div class="col-sm-12">
-            <span>
-                &#128075; What do you think about NuGet.org? We're looking for feedback from developers like you. <a href="https://aka.ms/NuGetSurvey" target="_blank">Take the survey.</a>
-            </span>
-        </div>
-    </div>
-</div>
-
 @helper DisplayNavigationItem(string tab, string url, bool bold = false, string title = null)
 {
     <li class="@(ViewBag.Tab == tab ? "active" : string.Empty)" role="presentation">