Add NodeJS documentation command

[michizhou]

Added code for fetching information about specific topics from NodeJS documentation website.

Closes #1228

[jaxxibae]

Command not functional and conflicting files. What's the usage for this command? https://nodejs.org/api/?q=HTTP just redirects to a normal HTML page, and not JSON content.

[jaxxibae]

Reccomendation: try to make a parser like nodejs-docs's parser, or at least make it search here: https://api.github.com/repos/nodejs/node/contents/doc/api