Redo Documentation

[phase]

Pyth's docs look fabulous. They're clean, organized, and they look professional. O's docs are unorganized, messy, not updated, and they look terrible. I want to completely redo the documentation in reStructuredText because RTD supports it the best. I'd also like to make a tutorial to get people using the language., which can have its own section on the docs.

/cc @kirbyfan64

[refi64]

O's docs aren't really bad, especially in comparison to some of the crap I've seen (I'm looking at you, SDL!). Though I agree with rST being better with RTD. I migrated Mypy's docs to Sphinx+rST in the past.

[phase]

I've started work on this in 2684f4e. I'll probably be focusing on it for a while.

[ghost]

The new docs are not as extensive as the old docs.

[refi64]

@Hipe99 Work-in-progress!

@phase Maybe the rest of the Markdown docs could just be converted as-is?

[phase]

I'd rather make the new docs from scratch, as the old docs don't recognize all the changes made with the new interpreter.