Consider syntax highlighting for shell sessions

[menschel-d]

Currently, code blocks that show interaction with the shell use plain text style.
It has already been discussed in issue #327 that the styles bash or sh are not appropriate since they're intended for shell scripts only.

As shell sessions are such a common case, they are supported by multiple highlighting engines, including both highlight.js and GitHub linguist.

In highlight.js, it is known as shell or console:
https://github.com/highlightjs/highlight.js/blob/master/src/languages/shell.js

In GitHub linguist, it is named ShellSession with the aliases bash session and console:
https://github.com/github/linguist/blob/2942bf9f1bf7a4871167c046c1e27d26cb198200/lib/linguist/languages.yml#L4410-L4421

Here is a demo in linguist (from ch01-03-hello-cargo.md):

$ cargo run
   Compiling hello_cargo v0.1.0 (file:///projects/hello_cargo)
    Finished dev [unoptimized + debuginfo] target(s) in 0.33 secs
     Running `target/debug/hello_cargo`
Hello, world!

I'd like to suggest the usage of console for the following reasons:

• It is supported by both highlight.js (and hence mdbook) and also GitHub linguist.
• It clearly states the intention.
• It should be less error prone than shell, which can easily be confused with sh (which is intended for shell scripts and not sessions).

[steveklabnik]

console sounds great!

[steveklabnik]

Almost two years later, I've now done this. Thanks for bringing it up!