Add anchor link for the logo wall (apache#25594)

Author: aaltay

website/www/site/layouts/case-studies/list.html

@@ -70,7 +70,7 @@ <h3 class="case-study-card-title">{{ .Params.cardTitle }}</h3>
             Share your story
         </a>
     </div>
-    <h2 class="case-study-h2">Also used by</h2>
+    <h2 class="case-study-h2" id="logos">Also used by</h2>
     <div class="case-study-list case-study-list--additional">
         {{ range where $pages "Params.category" "ne" "study" }}
             {{ if .Params.hasLink }}