Start on new version of specification

This is the start of a new specification Things I would like to improve on the existing specification - Include more of the whole project (parser, etc) - Split the current 5k file into smaller parts - Add more information around certain topics - A few more tests here and there for certain behavior - Also act as documentation for the project - Published on the web alongside the playground Currently running the code blocks is done by a `build.rs` and some helper methods. I think it would be cool to build out a general testing tool based on markdown. However, that is something more for the future. Initially we can do something similar to before but not using `build.rs` and generating a bunch of Rust code. Some first things to complete - [ ] Merge existing "documentation" - [ ] Merge existing tests - [ ] Enumerate file names - [ ] Think about layout more - [ ] Move to respective crate directories and use symbolic links Then - [ ] More tests - [ ] Lint and spell check markdown files - [ ] Publishing to HTML