tengqm and k8s-ci-robot Reorder concepts sections (#11032)
Order after this PR:

overview: 20
architecture: 30
containers: 40
workloads: 50
service-networking: 60
storage: 70
configuration: 80
policy: 90
cluster-administration: 100
extend-kubernetes: 110

Closes: #8570
Latest commit d3eaeef Nov 19, 2018