Fixes the GA scripts place to move them to headers and add site verif tag (#479)

Fixes #440 as RTD rewrites the GA scripts, was not expected, and we missed the
site verification meta tag to enable GA search console link
Signed-off-by: Adrian Sutton <adrian.sutton@consensys.net>

docs/custom_theme/main.html

@@ -7,18 +7,25 @@
       src="https://code.jquery.com/jquery-1.12.4.min.js"
       integrity="sha256-ZosEbRLbNQzLpnKIkEdrPv7lOy9C27hHQ+Xp8a4MxAQ="
       crossorigin="anonymous"></script>
-{% endblock %}
 
-{% block analytics %}
-  {% if config.google_analytics %}
+  {% if config.extra.google.analytics_id %}
     <!-- Global site tag (gtag.js) - Google Analytics -->
-    <script async src="https://www.googletagmanager.com/gtag/js?id={{ config.google_analytics[0] }}"></script>
+    <script async src="https://www.googletagmanager.com/gtag/js?id={{config.extra.google.analytics_id}}"></script>
     <script>
           window.dataLayer = window.dataLayer || [];
           function gtag(){dataLayer.push(arguments);}
           gtag('js', new Date());
 
-      gtag('config', '{{ config.google_analytics[0] }}');
+          gtag('config', '{{config.extra.google.analytics_id}}');
         </script>
   {% endif %}
+
+  {% if config.extra.google.site_verification %}
+    <!-- Google site verification for search console -->
+    <meta name="google-site-verification" content="{{config.extra.google.site_verification}}" />
+  {% endif %}
+{% endblock %}
+
+{% block analytics %}
+  <!--Empty the footer analytics bloc as we need it the headers -->
 {% endblock %}

mkdocs.yml

@@ -16,7 +16,6 @@ site_description: Pantheon Java Ethereum client documentation.
 site_author: Pantheon community
 copyright: Pantheon and its documentation are licensed under Apache 2.0 license /
   This <a href="https://readthedocs.org/">Readthedocs.org</a> documentation is maintained with love by <a href="https://pegasys.tech/">PegaSys</a>.
-google_analytics: ['UA-117921923-2', 'doc.pantheon.pegasys.tech']
 
 #extra project info and template customisation
 extra:
@@ -26,6 +25,9 @@ extra:
     footer_layout:
       background_color: lightseagreen
       links_color: white
+  google:
+    analytics_id: 'UA-117921923-2'
+    site_verification: 'za1cLzyS6LXDGO-pMzvfQdYTZ0Zc67uZtY0asA4YXZ0'
 
 
 # Repository