ipxreader.app: a home page for iPX (#216)

A static page in site/, built into site/dist by site/build.sh with the logo and icon from web/,
for Cloudflare Pages. The hero's dial is the iPodderX logo's tuning scale at full size, its
stations shows from the directory; the needle sweeps once on load (not with reduced motion) and
lights the one it stops on. One typeface, Archivo, self-hosted, its width axis doing the work.
No script; _headers sets a CSP that allows only the site's own files.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

site/_headers

@@ -0,0 +1,6 @@
+/*
+  Content-Security-Policy: default-src 'none'; img-src 'self'; style-src 'self'; font-src 'self'; base-uri 'none'; form-action 'none'; frame-ancestors 'none'
+  X-Content-Type-Options: nosniff
+  Referrer-Policy: strict-origin-when-cross-origin
+/fonts/*
+  Cache-Control: public, max-age=31536000, immutable