Default social media image and fix typo

layouts/_default/baseof.html

@@ -58,7 +58,7 @@
       </nav>
       {{- end }}
       {{- with .Site.Menus.tertiary }}
-      <br /><strong>Auxillary Pages</strong>
+      <br /><strong>Auxiliary Pages</strong>
       <nav class="app-header-menu">
         {{- range $key, $item := . }}
           {{- if ne $key 0 }}