feat(react-email): add application intro template

[adboio]

Hi team 👋

Please don't actually merge this 😛 It's not a bugfix, it's not a chore - it's just my job application, in PR form.

Added emails/hiring/meet-adam.tsx to the demos: an email template that introduces me and sneaks in a few resume highlights (plus a bonus).

Figured this was the best way to say hi, Resend-style!

If you close this, I'll take it as a rejection letter 😆

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Summary by cubic

Adds a new “HiringManagerIntro” email template to the demo that showcases a customizable applicant intro email with a one-click reply CTA. Improves demo coverage for Markdown lists, preview text, and dark-themed styling.

• New Features
  • New template at apps/demo/emails/hiring/meet-adam.tsx.
  • Configurable props: roleTitle, companyName, applicantName, contactEmail, highlights, portfolioUrl.
  • Renders highlights via Markdown, includes preview text, and a mailto CTA button.
  • Dark theme with accessible link colors and card layout using @react-email components.

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