Add Posthog to Site

[bryantgillespie]

This adds PostHog A/B testing and event capture for the site.

A/B Tests

• Page (redirect) tests - for testing totally separate pages
• Block tests - for testing different headers or calls to action on the same page (currently on work on Pages collection)

For block level tests - the site will need to be redeployed. But for page level tests - these are entirely handled within Posthog using the payloads

Event Capture

• Captures all pageviews automatically
• Hubspot form submissions
• Dyanmic button click events from CMS

Breaking Changes

• Moves from build process from nuxt generate to nuxt build so we can easily proxy the Posthog API.
  • All content is still pre-rendered though as we currently fetch data from within each individual block.

Before Publishing

• Uncomment the GTM Nuxt Module
• Remove Posthog script from GTM
• Merge separate PH projects into one

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[alexchopin]

Looks good to me with a really fast review. I would like to have @connorwinston approval too.