Reogranize documentation using Documentation Authoring Framework

[dmitry-kabanov]

The documentation should be split in four sections, according to the Documentation Authoring Framework:

• Getting Started
  • Overview
  • Installation
  • Running VdP example from Python
  • Running VdP example using C
• How-to
  • How to write an implementation for IVP
• Explanation
  • Architecture, data flow, and realization details
  • Data Types
  • Data Passing and Function Calls
• API Reference
  • Available Interfaces
  • C Interfaces
  • Python Interfaces