undo flavicon atemps

I give up cant make a favicon appear on this site, even though it worked on the main gensc.org one! This reverts my changes, but I have left the favicon icon in the root and assets/img directories

_config.yml

@@ -52,9 +52,6 @@ round-avatar: false
 # title-img: "/assets/img/Main_gsc_logo_2010.jpg"
 title-img: "/assets/img/gsc_logo_sml.png"
 
-# To add a flavicon to the web-tab simply provide a favicon.ico file in the root directory
-favicon: "/assets/img/favicon.ico"
-
 #####################################
 # --- Footer social media links --- #
 #####################################

_includes/head.html

@@ -2,8 +2,6 @@
   <meta charset="utf-8">
   <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
 
-  <link rel="shortcut icon" type="image/x-icon" href="/assets/img/favicon.ico?">
-
   {% capture title %}
     {%- if page.share-title -%}
       {{ page.share-title | strip_html | xml_escape }}