Instrument docs with segment (#1984)

Author: paoloredis

layouts/_default/baseof.html

@@ -48,6 +48,7 @@
     {{ end -}}
 
     <script src='{{ "js/index.js" | relURL }}' defer></script>
+    {{ partial "segment.html" . }}
     {{ if .Params.math }}
         {{ partial "mathjax.html" }}
     {{ end }}

layouts/partials/segment.html

@@ -0,0 +1,10 @@
+<script>
+    !function(){var i="analytics",analytics=window[i]=window[i]||[];if(!analytics.initialize)if(analytics.invoked)window.console&&console.error&&console.error("Segment snippet included twice.");else{analytics.invoked=!0;analytics.methods=["trackSubmit","trackClick","trackLink","trackForm","pageview","identify","reset","group","track","ready","alias","debug","page","screen","once","off","on","addSourceMiddleware","addIntegrationMiddleware","setAnonymousId","addDestinationMiddleware","register"];analytics.factory=function(e){return function(){if(window[i].initialized)return window[i][e].apply(window[i],arguments);var n=Array.prototype.slice.call(arguments);if(["track","screen","alias","group","page","identify"].indexOf(e)>-1){var c=document.querySelector("link[rel='canonical']");n.push({__t:"bpc",c:c&&c.getAttribute("href")||void 0,p:location.pathname,u:location.href,s:location.search,t:document.title,r:document.referrer})}n.unshift(e);analytics.push(n);return analytics}};for(var n=0;n<analytics.methods.length;n++){var key=analytics.methods[n];analytics[key]=analytics.factory(key)}analytics.load=function(key,n){var t=document.createElement("script");t.type="text/javascript";t.async=!0;t.setAttribute("data-global-segment-analytics-key",i);t.src="https://cdn.segment.com/analytics.js/v1/" + key + "/analytics.min.js";var r=document.getElementsByTagName("script")[0];r.parentNode.insertBefore(t,r);analytics._loadOptions=n};analytics._writeKey="WRrz9T87YdiSbmMaU8rm2JAq7EFKp5H4";;analytics.SNIPPET_VERSION="5.2.0";
+    analytics.load("WRrz9T87YdiSbmMaU8rm2JAq7EFKp5H4");
+    }}();
+</script>
+<script>
+    analytics.track('PageViewed', {
+      page_name: name || (typeof window !== 'undefined' ? window.location.pathname : undefined)
+    });
+</script>