Add more links to the docs (#4204)

docs/_sidebar.md

@@ -1,13 +1,19 @@
 * [Readme](/)
 * [Comparisons](/docs/comparisons.md)
 * [Getting started](/docs/getting-started.md)
+* [Ansible](docs/ansible.md)
 * [Variables](/docs/vars.md)
 * [Ansible](/docs/ansible.md)
-* [Upgrades](/docs/upgrades.md)
+* Operations
+  * [Integration](docs/integration.md)
+  * [Upgrades](/docs/upgrades.md)
+  * [HA Mode](docs/ha-mode.md)
+  * [Large deployments](docs/large-deployments.md)
 * CNI
   * [Calico](docs/calico.md)
   * [Contiv](docs/contiv.md)
   * [Flannel](docs/flannel.md)
+  * [Kube Router](docs/kube-router.md)
   * [Weave](docs/weave.md)
   * [Multus](docs/multus.md)
 * [Cloud providers](docs/cloud.md)
@@ -16,7 +22,18 @@
   * [OpenStack](/docs/openstack.md)
   * [vSphere](/docs/vsphere.md)
 * Operating Systems
+  * [Atomic](docs/atomic.md)
   * [Debian](docs/debian.md)
   * [Coreos](docs/coreos.md)
   * [OpenSUSE](docs/opensuse.md)
+* Advanced
+  * [Proxy](/docs/proxy.md)
+  * [Downloads](docs/downloads.md)
+  * [CRI-O](docs/cri-o.md)
+  * [Netcheck](docs/netcheck.md)
+  * [DNS Stack](docs/dns-stack.md)
+  * [Kubernetes reliability](docs/kubernetes-reliability.md)
+* Developers
+  * [Test cases](docs/test_cases.md)
+  * [Vagrant](docs/vagrant.md)
 * [Roadmap](docs/roadmap.md)