Opting out of FLoC

All Cr;Lf; pages will now have a Permissions-Policy: interest-cohort=() header set.

I also added the microphone=(), camera=(), geolocation=() in the permissions, because this site doesn’t use them.

Resources:

https://github.com/WICG/floc#opting-out-of-computation
https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Feature-Policy

@notes #crlf