temporarily disable Trusted Types for web-install

This can be enabled again when the zip library supports it.

nginx/snippets/security-headers.conf

@@ -1,5 +1,7 @@
 include snippets/security-headers-base.conf;
 
+add_header Content-Security-Policy "default-src 'none'; connect-src 'self' https://releases.grapheneos.org/; font-src 'self'; img-src 'self'; manifest-src 'self'; script-src 'self'; style-src 'self'; form-action 'none'; frame-ancestors 'none'; block-all-mixed-content; base-uri 'none'; require-trusted-types-for 'script'" always;
+
 add_header Permissions-Policy "accelerometer=(), ambient-light-sensor=(), autoplay=(), battery=(), camera=(), display-capture=(), document-domain=(), encrypted-media=(), fullscreen=(), geolocation=(), gyroscope=(), magnetometer=(), microphone=(), midi=(), payment=(), picture-in-picture=(), publickey-credentials-get=(), screen-wake-lock=(), sync-xhr=(), usb=(), xr-spatial-tracking=()" always;
 
 # Feature-Policy is being replaced by Permissions-Policy