Move applink, proxy add buttons to appstore view

src/theme.scss

@@ -836,16 +836,15 @@ multiselect {
     }
 }
 
-.appstore-toolbar {
-    position: fixed;
-    padding: 0;
-    background: transparent;
-    z-index: 2;
-    padding-top: 20px;
-    padding-bottom: 15px;
+.appstore-layout {
+    display: block;
+    height: 100%;
+    width: 100%;
+}
 
-    // below to not hide the scrollbar partly
-    width: calc(100% - 30px);
+.appstore-toolbar {
+    padding: 15px 0;
+    background: transparent;
     margin: 0 15px;
 
     .appstore-toolbar-content {
@@ -883,7 +882,8 @@ multiselect {
 
 .appstore-grid {
     margin: auto;
-    margin-top: 65px;
+    overflow: auto;
+    height: calc(100% - 65px); // offset navigation bar
     width: calc(100% - 30px); // -30px to offset .row margins
     max-width: 1200px;