Add Permissions-Policy response header to opt out of Google FLoC

wethepeople.pl

@@ -13,6 +13,10 @@ get '/' => sub {
     else {
         $c->redirect_to("$scheme://www.wethepeople.win")
     }
+
+    # Opt out of Google FLoC
+    # https://paramdeo.com/blog/opting-your-website-out-of-googles-floc-network
+    $c->res->headers->header('Permissions-Policy', 'interest-cohort=()');
 } => 'index';
 
 app->start();