Fixes #1

Create initial documentation structure using sphinx.
Merge pull request #2 from rockstor/issue#1

Fixes #1
conf.py update for sidebar and toc
improved homepage
Initial set of linked documents. Mostly stub
install document updates
feature overview content
service page
support page
headline underline correction
Merge branch 'master' of https://github.com/rockstor/rockstor-doc
add common disk operations
User interfaces documentation

Add description for Web UI and RockStor setup process
Add setup process image
documentation for user interfaces

Add description for cli
Add screenshot for cli
User administration

Add documentation for create and edit user
Add images for create and edit user
Services documentation
pool and share operations
nfs operations
Dashboard documentation

Add documentation and images for dashboard and widgets
Add network widget image to dashboard documentation