feat: make copy focus on newsletter

[jsjoeio]

• docs: change CTA to focus on newsletter
• fix: remove waitlist copy from thank you
• fix: make thank you mobile friendly

[vercel[bot]]

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Name	Status	Preview	Comments	Updated (UTC)
speak-argentinian-spanish	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 5, 2023 8:42pm