Add Consul link to HA docs

Consul is missing from the install links

doc/administration/high_availability/README.md

@@ -82,12 +82,13 @@ Complete the following installation steps in order. A link at the end of each
 section will bring you back to the Scalable Architecture Examples section so
 you can continue with the next step.
 
+1. [Load Balancer(s)](load_balancer.md)[^2]
+1. [Consul](consul.md)
 1. [PostgreSQL](database.md#postgresql-in-a-scaled-environment) with [PGBouncer](https://docs.gitlab.com/ee/administration/high_availability/pgbouncer.html)
 1. [Redis](redis.md#redis-in-a-scaled-environment)
 1. [Gitaly](gitaly.md) (recommended) and / or [NFS](nfs.md)[^4]
 1. [GitLab application nodes](gitlab.md)
     - With [Object Storage service enabled](../gitaly/index.md#eliminating-nfs-altogether)[^3]
-1. [Load Balancer(s)](load_balancer.md)[^2]
 1. [Monitoring node (Prometheus and Grafana)](monitoring_node.md)
 
 ### Full Scaling