title: using npm scripts to Inject *.js and *.css into index.html
body: <p>I´m looking into switch from gulp/grunt to only use npm scripts.
  But I cant really solve how to get *.js and *.css from a given path and add it to the index.html file.</p>
  
  <p>must I add it thru a "index.js" file or can I do something like...</p>
  
  <pre><code>"scripts": {
   "inject": "inject src/app/*.js",
  },
  </code></pre>
  
  <p>and then it will add it in my index.html where I have specified it like...</p>
  
  <pre><code>/* inject:js */
  </code></pre>