[Umbrella issue] Restructuring the documentation

[divya-mohan0209]

This is a suggestion for restructuring the documentation based on the Divio paradigm

The TOC ends up looking as below

• Introduction
• Quickstart a.k.a. creating your very first component (This is the Tutorial section fleshed out a bit more with pre-requisites from the Language Support Section and also renamed)
• Understanding the Component Model (Explanation)
  • Why the component model?
  • Components
  • Interfaces
  • WIT
  • Worlds
  • Packages
  • Canonical ABI
• Using the Component Model (How to)
  • Creating and consuming components
    • Authoring components
    • Composing components
    • Running components
    • Distributing components
• Reference documentation (Reference implementations of the Component Model)
• Language support for components
  • Rust
  • Javascript
  • Python