Add reference to Domain/SSL in "How To" README

[cbortz]

Changes

• Create "pointer" to external Domain/SSL doc
• Add reference to "pointer" Domain/SSL doc
• Convert format from reStructured Text to Markdown
• Reformat Development Workflow document
  • Uses clearer, simpler heading levels

[cbortz]

I think there may be some other documents that we want to create "pointers" for, and place behind our private repo.