Updating Google Analytics to track user experience

[Hganavak]

• First investigating whether to use the existing model or to redesign it to be more extendable for future user experience tracking.

[Hganavak]

• About to patch an existing Google Analytics issue resulting in inconsistent page names.
• Will then deploy to test server.
• Note that this branch also fixed an issue that was discovered with the 'sort by' switcher not working.

[Hganavak]

• Deploying to test server.

[Hganavak]

• Tests successful, deploying to prod.