Generate documentation via Docker

I updated the generate_docs script to generate documentation via docker (https://github.com/jbt/docker)

We are documenting the following files/directories:
  - .venus/adaptors
  - bin
  - js
  - lib
  - setup
  - CHANGELOG.md
  - CONTRIBUTING.md
  - README.md
  - Venus.js

All documentation will be generated into the docs directory

Using docker, I have implemented the following options:
   - show line numbers
   - be able to search for a file (Cmd+P)
   - be able to go to line number (Cmd+G)

I will submit subsequent pull requests to refine the documentation on each of the files