GitHub Page for DNS config in dynamic cluster.

[galiacheng]

Hello @edburns this PR has 2 prerequisites:

• This PR has been merged: Automation script for custom DNS config.
• Create new tags for 4 offers
  • Tag name: 2021-02-10-03-Q1
  • new tag - singlenode
  • new tag - singlenode-admin
  • new tag - configured-cluster
  • new tag - dynamic-cluster

Changes to be committed: modified: Makefile modified: _data/var.yml new file: dynamic-cluster/customDNSTemplate.md modified: dynamic-cluster/index.md new file: subtemplate-src/dynamic-customDNSTemplate.md