Remove `type` attribute from `link` and `script` elements

HTML5 specifies default values for the `type` attribute on `script`, `style`,
and `link` elements. Unless you need a different value than the default, you can
simply omit the `type` attribute.

Closes #1
Merge pull request #1 from KenanY/remove-type-attribute

Remove `type` attribute from `link` and `script` elements