feat: refresh landing page and vercel deployment

[mdabir1203]

Summary

• restyle the marketing landing page with a luxury-focused layout, refined copy, and updated pricing experience
• add a static export binary and landing-page/index.html for vercel hosting alongside a configuration file
• document the export workflow and vercel deployment steps in the README

Testing

• cargo fmt
• cargo clippy --workspace --all-targets -- -D warnings
• cargo test --workspace

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https://chatgpt.com/codex/tasks/task_e_68f4f3050ba48326923fdb88e23d1763

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Fix malformed disabled-copy attribute string

Plans without Stripe checkout should render data-disabled-copy="Email us to activate payments" so the JS can surface the custom message. The new raw string literal includes a trailing double quote (data-disabled-copy="…""), so browsers parse the attribute value as Email us to activate payments" and button.dataset.disabledCopy ends up undefined. As a result the button falls back to the generic “Talk to sales” text even when a specific message is provided. Remove the extra quote so the dataset attribute is valid.

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