SchooLinks SSH config tweaks.

- Use the IP address for staging's API (now it behind a load-balancer).
- Local forward Flower for the Celery server.

.ssh/config.d/20_schoolinks

@@ -5,6 +5,12 @@
 Host api.schoolinks.com
     Hostname 35.170.212.119
 
+Host api-staging.schoolinks.com
+    HostName 34.226.30.250
+
+Host celery.schoolinks.com
+    LocalForward 5555 localhost:5555
+
 Host ci.schoolinks.com
     IdentityFile ~/.ssh/schoolinks_ci_rsa