Add a documentation generating CI job

[John15321]

Add a CI job that generates documentation that we have stored in our project and produces some readable format that can be either downloaded or publish as a web page. Rust has two types of documentation:

• The API documentation which is something you can read on creates.io
• A Rust Book for a given project that is a more abstract representation of a project and usually has some guides, tutorials etc

Blocked by:

• https://github.com/John15321/rust-pip/issues/34
• https://github.com/John15321/rust-pip/issues/33
• https://github.com/John15321/rust-pip/issues/32
• https://github.com/John15321/rust-pip/issues/31
• https://github.com/John15321/rust-pip/issues/30