chore: added script to dev site home

[jpvajda]

This PR attempts to add the crazy egg script to the developer site home page as well, so both the / page an /instant-observability/ both have the script running.

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Performance	🔶 27
Accessibility	💚 90
Best Practices	🔶 87
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[jpvajda]

This approach to use / as the path with an || seems to throw the same errors as using a ternary operator...

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

[jpvajda]

I've added a path for index.html, but it seems the script is still not firing on the index page in local testing

[nr-opensource-bot]

🎉 This PR is included in version 1.69.0 🎉

The release is available on GitHub release

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