• GH-2248: Update CTA & links to Plus, Premium, and free trial subscrip… 

    …tions (#671)

* Restore free trial link. Add UTM params to premium checkout link. Update CTA button copies. Ensure user is on a plus trial after redirecting to glowstery domains

* Remove unused variable
    @benstrumeyer
    benstrumeyer committed Jan 29, 2021
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