Add component option to docs command

[joshuamorony]

I started writing my own CLI utility to do this but if the team would be open to adding this I would love to send a PR.

Basically, I would like to add a component/-c option to the ionic docs command that would open the relevant component directly in the documentation. For example, running:

ionic docs -c button

would open:

https://ionicframework.com/docs/api/badge