Make a lighter user doc

Make a lighter user doc with blocks to be re-used in dev doc as functional overview.

In the end we should have the following pages:

• Concepts

• Browsing Content
  • Tags
  • Collections
  • Preview

• Securing Access

• Document Types

• Importing content

• Editing Content
  • WebDav

• Tracability

• Deleting Content

• Collaborative Features

• Searching
  • Default Search (Search tab)
  • Quick search (with suggestion)
  • Saved searches

• Workflows
  • Serial workflow
  • Parallel workflow
  • Delegating and reassigning

• Publishing Content

• Exporting Content

• Local Configuration

• Application Admin
  • Vocabularies
  • Users & Groups

• Digital Asset Management Overview

• Case Management Overview

• Adding Features
  • Every addons