Docs: Better Next.js pageleave

[ivanagas]

Changes

While updating the single-page app pageview tutorial, I realized pageleaves in SPAs was undercaptured to. Now that they are becoming more useful, it is good idea to encourage people to capture them.

Add a better option for capturing them using some code from web analytics, tested locally. Let me know if you'd suggestion another method.

Also some random cleanup of this page.

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