Replace herestring with a portable version
Add new documentation

Replace the quickstart with a cleaner version (in Markdown format)

Add doc/ subdir with a basic Readme, Advanced docs, and an Intro-To-PKI

Add initial distro docs for Windows, including Licensing
Add Licensing/ dir
Add Windows scripts to distro/ structure; minor re-org here too

The Windows doc is now under a doc/ subdir.

Windows-specific scripts are in a structure that matches the top-level
Easy-RSA dir structure.