Support CSP headers generation for static content on Vercel

[castarco]

To improve the usability of Astro-Shield, it would be good to support the generation of headers metadata specific for the Vercel provider, so we can generate CSP headers for static content.

Reference

• See https://vercel.com/docs/projects/project-configuration#headers

Status

• Main implementation (feat: generate csp headers for static content served on vercel #111, fix: headers are not correctly configured for vercel #121)
• Support for "dev resources" (dev toolbar loaded in deployed development branches)

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[castarco]

Accidentally closed