use self-hosted fontawesome into the template

Author: MetalArend

_layouts/bootstrap4.html

@@ -25,15 +25,13 @@
         'self'
         'unsafe-inline'
         https://stackpath.bootstrapcdn.com
-        https://use.fontawesome.com
     ;
     script-src
         'self'
         'unsafe-eval'
         https://code.jquery.com
         https://cdnjs.cloudflare.com
         https://stackpath.bootstrapcdn.com
-        https://use.fontawesome.com
         https://www.google-analytics.com
     ;
 ">
@@ -44,7 +42,7 @@
 
 <!-- Stylesheets -->
 <!-- Font Awesome -->
-<link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.1.1/css/all.css" integrity="sha384-O8whS3fhG2OnA5Kas0Y9l3cfpmYjapjI0E4theH4iuMD+pLhbf6JI0jIMfYcK3yZ" crossorigin="anonymous">
+<link rel="stylesheet" href="{{ '/assets/fontawesome-free/css/all.css' | relative_url }}"/>
 <!-- Bootstrap CSS and own styles -->
 <link rel="stylesheet" type="text/css" href="{{ '/assets/css/style.css' | relative_url }}"/>
 
@@ -122,8 +120,7 @@ <h1>{{ page.title }}</h1>
 <script src="{{ '/assets/js/app.js' | relative_url }}"></script>
 {% endif %}
 <!-- Font Awesome -->
-<!--<script src="https://use.fontawesome.com/2dbb7b4a28.js" async></script>-->
-<script defer src="https://use.fontawesome.com/releases/v5.1.1/js/all.js" integrity="sha384-BtvRZcyfv4r0x/phJt9Y9HhnN5ur1Z+kZbKVgzVBAlQZX4jvAuImlIz+bG7TS00a" crossorigin="anonymous"></script>
+<script defer src="{{ '/assets/fontawesome-free/js/all.js' | relative_url }}"></script>
 <!-- Bootstrap initialisation -->
 <script src="{{ '/assets/js/bootstrap.js' | relative_url }}" async></script>
 <!-- Google Analytics -->