Remove Google Analytics tags to improve caching

remove-ga-tags.inc.conf

if ($args ~ (.*)utm_source=[^&]*(.*)) {
	set $args $1$2;
}
if ($args ~ (.*)utm_medium=[^&]*(.*)) {
	set $args $1$2;
}
if ($args ~ (.*)utm_term=[^&]*(.*)) {
	set $args $1$2;
}
if ($args ~ (.*)utm_content=[^&]*(.*)) {
	set $args $1$2;
}
if ($args ~ (.*)utm_id=[^&]*(.*)) {
	set $args $1$2;
}
if ($args ~ (.*)utm_campaign=[^&]*(.*)) {
	set $args $1$2;
}
if ($args ~ (.*)gclid=[^&]*(.*)) {
	set $args $1$2;
}
# cleanup any repeated '&' introduced
if ($args ~ (.*)&&+(.*)) {
	set $args $1&$2;
}
# cleanup leading '&'
if ($args ~ ^&(.*)) {
	set $args $1;
}
# cleanup ending '&'
if ($args ~ (.*)&$) {
	set $args $1;
}