Add links to Documenting Modules page (3.0)

Add link to modules_documentation.html page to each modules page.
Actually commented out the comment in Module Fundamentals.
Create new page for README template

Create new, standalone page for the module README template.
Create new page for Documenting Modules

This page is a walk through of the README template with a link to the
standalone template. Best practices are being worked out with Hunter,
Ryan, myself and a community member.