Add Streisand guide to index.md

Author: Jskobos

docs/networking/vpn/index.md

@@ -11,7 +11,7 @@ featured:
  - pritunl-vpn-ubuntu.md
  - secure-communications-with-openvpn-on-centos-6.md
  - secure-communications-with-openvpn-on-ubuntu-12-04-precise-and-debian-7.md
-
+ - set-up-a-streisand-gateway.md
 ---
 
 Learn how to use your Linode to manage a virtual private network (VPN). These guides will help you get up and running quickly with OpenVPN solution on a variety of Linux distributions.