Update the self-hosting guides with the new name

docs/self-hosted-nmaas/install-guide.md

docs/self-hosted-nmaas/introduction.md

docs/self-hosted-nmaas/local-dev-environment/appendix.md

docs/self-hosted-nmaas/local-dev-environment/introduction.md

...maas/local-dev-environment/p1_local-kubernetes-cluster.md

...hosted-nmaas/local-dev-environment/p2_installing-nmaas.md

...maas/local-dev-environment/p3_demo-network-environment.md

...dev-environment/p4_monitoring-demo-network-environment.md

...osted-nmaas/local-dev-environment/p5_adding_custom_app.md