fix: clean missing reference

Author: 3xau1o

_includes/footer.html

@@ -20,11 +20,5 @@
         <p>{{ site.description | escape }}</p>
       </div>
     </div>
-
-    <div class="social-links">
-      {%- include social.html -%}
-    </div>
-
   </div>
-
 </footer>

_includes/head.html

@@ -27,8 +27,5 @@
     {%- feed_meta -%}
     {%- if jekyll.environment == 'production' and site.google_analytics -%}
       {%- include google-analytics.html -%}
-    {%- endif -%}
-  
-    {%- include custom-head.html -%}
-    
+    {%- endif -%}    
 </head>