[Dev Site] Add crazyegg tracking to script to Devsite home

[jpvajda]

Relates to #1818

Jason Chen is asking to add CrazyEgg to analyze the click patterns as It will help us in seeing where customers are clicking and will give us a heatmap.

<script type="text/javascript" src="//script.crazyegg.com/pages/scripts/0045/9836.js" async="async" ></script>

Acceptance Criteria

• Do a performance test after deploy to understand impact and provide data on impact.
• Add script to this page https://developer.newrelic.com
• When done, confirm with JasonChen -- @jpvajda
• confirm if this is temporary or permanent with JasonChen -- @jpvajda

[jpvajda]

I have a PR for this change, but I don't think Gatsby like the use of the tienary operator as I'm seeing an error, though the site builds and the script seems to fire ok on each page I've set it on.

[jpvajda]

Used an || statement instead, seemed to work... 🤷

[jpvajda]

This approach also seems to throw the same errors

Uncaught Error: CE: multiple userscripts installed
    <anonymous> http://script.crazyegg.com/pages/scripts/0045/9836.js:1
9836.js:1:70
    <anonymous> http://script.crazyegg.com/pages/scripts/0045/9836.js:1