Added GTM code

Author: Kyle Kirkby

_config-production.yml

@@ -11,4 +11,4 @@ production: true
 # Google Analytics
 google_analytics:
   enabled: true
-  code: G-83W8JRZD44
+  code: GTM-MSHJQDC

_config.yml

@@ -95,7 +95,7 @@ http2_resources:
     href: /assets/fonts/lato/Lato-regular.woff2
 google_analytics:
   enabled: false
-  code: G-83W8JRZD44
+  code: GTM-XXXX
   cookies:
     necessary:
       - name: cookieControl
@@ -202,4 +202,4 @@ asset_pipeline:
   compress: true
   output_path: assets/js
   gzip: true
-breadcrumb_banner: /assets/images/breadcrumb-banner.jpg
+breadcrumb_banner: /assets/images/breadcrumb-banner.jpg