fix(web): remove Tailwind from CSS email template

[yanthomasdev]

This PR changes the CSS email template sample used in the landing page to not include <Tailwind> which is counter-intuitive to the intent of showing an email with basic CSS. I've removed the var(--font-sans) for an inline value, since --font-sans is a variable set by Tailwind.

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Summary by cubic

Removed Tailwind from the CSS email template example so the landing page shows a true plain CSS email.
Dropped the Tailwind import and wrapper, and replaced var(--font-sans) with an inline system font stack.

^{Written for commit 537692e. Summary will update on new commits.}

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Latest commit: 537692e

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[cubic-dev-ai]

No issues found across 1 file