Enable gzip compression & add expires headers in nginx

nginx.conf

# /etc/nginx/nginx.conf

##
# `gzip` Settings
#
#
gzip on;
gzip_disable "msie6";

gzip_vary on;
gzip_proxied any;
gzip_comp_level 6;
gzip_buffers 16 8k;
gzip_http_version 1.1;
gzip_min_length 256;
gzip_types text/plain text/css application/json application/x-javascript text/xml application/xml application/xml+rss text/javascript application/vnd.ms-fontobject application/x-font-ttf font/opentype image/svg+xml image/x-icon;

# and in each site-available configs

	location ~*  \.(jpg|jpeg|png|gif|ico|css|js|woff2)$ {
	   expires 30d;
	}