Update Referral look and mobile optimizations

[ronnyhaase]

• Optimize for portrait mode with pure CSS
• Remove JS-based mobile optimizations
• Update tweet message and use direct link to tweet
• Fix cut content on the hub
• Move the help button slightly right to not overlap
• Further minor optimizations

[vercel[bot]]

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Name	Status	Preview	Comments	Updated (UTC)
app	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 22, 2023 11:44am