Adding User Guide

* Added User Guide section outlines.
* Added User Guide to menu.
* Moved HTTPS example to articles.
* Replaced Hello World example with User Guide.
* Moved use cases out of examples.
* Updated Introduction to add User Guide.
* Redirected migrated /use and /articles links.
* Added Docker.io section
* Added Dockerized section
* Added Using Docker section
* Added Docker Images section
* Added Docker Links section
* Added Docker Volumes section

Docker-DCO-1.1-Signed-off-by: James Turnbull <james@lovedthanlost.net> (github: jamtur01)
Merge pull request #6154 from SvenDowideit/pr_out_adding_user_guide

Adding User Guide
Update networking.md

grammar

Docker-DCO-1.1-Signed-off-by: Andre Dublin <81dublin@gmail.com> (github: andredublin)

rebased by

Docker-DCO-1.1-Signed-off-by: SvenDowideit <SvenDowideit@home.org.au> (github: SvenDowideit)
Merge pull request #6157 from SvenDowideit/pr_out_update_networking_md

Update networking.md