- Add CSP meta tag to index.html since GitHub Pages does not serve
custom headers from _headers files. Includes 'unsafe-inline' for
the theme-flash-prevention script.
- Add note to _headers explaining the GitHub Pages limitation.
- Also fix script-src in _headers to include 'unsafe-inline' to
match the inline theme script that runs before React hydrates.
- Generate android-chrome-192x192.png and android-chrome-512x512.png
from apple-touch-icon.png. These were referenced in site.webmanifest
but missing, causing 404s on PWA installs.
- Update og:url from contribute.btcpayserver.org (domain has no DNS
records) to pavle.org (the actual live domain).
