Add reference to nu_plugin_bash_env

[tesujimath]

No description provided.

[fdncred]

Thanks! I moved some things around to keep them in order. I'm not a huge fan of the dependency on cat and jq but it's interesting since it's a bash plugin. How did you noodle all this stuff out?

[tesujimath]

Ah yes, I wrote some Rust which used nu-protocol, created some Values and spat out some JSON.

I realised parsing Bash environment files with anything other than Bash was going to be an absolute mission.