Docs tests & a refactor

lib/heroicons/outline.ex

@@ -4,6 +4,6 @@ defmodule Heroicons.Outline do
 
   For primary navigation and marketing sections, designed to be rendered at 24x24.
   """
-  @icon_path "#{:code.priv_dir(:heroicons)}/outline/"
+  @icon_dir "outline/"
   @before_compile Heroicons
 end

lib/heroicons/solid.ex

@@ -5,6 +5,6 @@ defmodule Heroicons.Solid do
   For buttons, form elements, and to support text, designed to be rendered at 20x20.
   """
 
-  @icon_path "#{:code.priv_dir(:heroicons)}/solid/"
+  @icon_dir "solid/"
   @before_compile Heroicons
 end