ng: refactor README

plugins/ng/README.md

-## NG Plugin
+# ng plugin
 
-This [ng plugin](https://github.com/ohmyzsh/ohmyzsh/tree/master/plugins/ng)
- adds completion support for Angular's CLI (named ng).
+This plugin adds autocompletion support for [Angular's CLI](https://github.com/angular/angular-cli)
+(named `ng`).
 
-Ng is hosted on [ng home](https://github.com/catull/angular-cli)
-
-It is used to generate Angular 2 app "stubs", build those apps, configure them,
-test them, lint them etc.
-
-Ahem, "stubs" is not what Angular engineers refer to the items ng can generate
-for you.
-
-"Stubs" can be any one of:
-- class
-- component
-- directive
-- enum
-- module
-- pipe
-- route
-- service
-
-At the moment, `ng completion` creates a very rough completion for Zsh and
-Bash.
-
-It is missing most of the options and a few arguments.
-In future, this plugin may be shortened to simply being
+To use it, add `ng` to the plugins array of your zshrc file:
 
 ```zsh
-eval `ng completion`
+plugins=(... ng)
 ```
-
-There is hope this materialises in the 21st century.
-
-### CONTRIBUTOR
- - Carlo Dapor ([catull](https://github.com/catull))