Browesable version of the spec

Currently, the spec is in raw form as Markdown files. We need a compiled version with table of content, navigation menu and any other feature that would increase readability of a specification document.

We need to be able to produce the following output format:

• HTML with styles
• PDF

The following processors are currently considered:

1. Sphinx + Read the Docs template
2. Hugo + Learn theme
3. Bikeshed (Used by groups like the W3C)

Please let us know if you know another good processor.