Update app icon ref to be via relative url

Author: stnguyen90

_includes/head.html

@@ -7,7 +7,7 @@
 	<title class="pageTitle">{{ site.page_title }}</title>
 	<meta name="description" content="{{ site.app_description }}">
 
-	<link rel="shortcut icon" href="{{ site.app_icon }}">
+	<link rel="shortcut icon" href="{{ site.app_icon | relative_url }}">
 
 	<!-- Smart App Banner -->
 	{% if site.enable_smart_app_banner %}

_includes/header.html

@@ -9,9 +9,9 @@
 				</defs>
 			</svg>
 			{% if page.url != '/' %}
-				<a href="../" target="_self"><img class="headerIcon" src="{{ site.app_icon }}"></a>
+				<a href="../" target="_self"><img class="headerIcon" src="{{ site.app_icon | relative_url }}"></a>
 			{% else %}
-				<img class="headerIcon" src="{{ site.app_icon }}">
+				<img class="headerIcon" src="{{ site.app_icon | relative_url }}">
 			{% endif %}
 			<div class="divider"></div>
 		</div>

_layouts/default.html

@@ -35,7 +35,7 @@
                                     </clipPath>
                                 </defs>
                             </svg>
-                            <img class="appIconLarge" src="{{ site.app_icon }}">
+                            <img class="appIconLarge" src="{{ site.app_icon | relative_url }}">
                         </div>
                         <div class="appNamePriceContainer">
                             <h1 class="appName">