Revert "Revert "survey banner (#8249)" (#8262)" (#8272)

This reverts commit 1f64ee4.

Author: lyndaidaii

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

@@ -22,6 +22,16 @@
     </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.&emsp;<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">
@@ -241,4 +251,4 @@
             </div>
         </div>
     </div>
-}
+}