Rename /icons folder in public as it is aliased by apache.

Before icons were not loaded in most cases when using apache2 with default configuration.
Fixes issue #120

templates/base.html.twig

@@ -10,7 +10,7 @@
     <meta name="apple-mobile-web-app-capable" content="yes">
     <meta name="application-name" content="Part-DB">
     <meta name="apple-mobile-web-app-title" content="Part-DB">
-    <meta name="msapplication-config" content="{{ asset('icons/browserconfig.xml') }}">
+    <meta name="msapplication-config" content="{{ asset('icon/browserconfig.xml') }}">
     <meta name="theme-color" content="#ffffff">
     <meta name="theme-color" content="#ffffff">
     <meta name="msapplication-navbutton-color" content="#ffffff">
@@ -18,11 +18,11 @@
     <meta name="msapplication-starturl" content="/en/">
 
 
-    <link rel="shortcut icon" type="image/x-icon" href="{{ asset('icons/favicon.ico') }}">
-    <link rel="apple-touch-icon" sizes="180x180" href="{{ asset('icons/apple-touch-icon.png') }}">
-    <link rel="icon" type="image/png" href="{{ asset('icons/favicon-32x32.png') }}" sizes="32x32">
-    <link rel="icon" type="image/png" href="{{  asset('icons/favicon-16x16.png') }}" sizes="16x16">
-    <link rel="mask-icon" href="{{ asset('icons/safari-pinned-tab.svg') }}" color="#5bbad5">
+    <link rel="shortcut icon" type="image/x-icon" href="{{ asset('icon/favicon.ico') }}">
+    <link rel="apple-touch-icon" sizes="180x180" href="{{ asset('icon/apple-touch-icon.png') }}">
+    <link rel="icon" type="image/png" href="{{ asset('icon/favicon-32x32.png') }}" sizes="32x32">
+    <link rel="icon" type="image/png" href="{{  asset('icon/favicon-16x16.png') }}" sizes="16x16">
+    <link rel="mask-icon" href="{{ asset('icon/safari-pinned-tab.svg') }}" color="#5bbad5">
 
 
     <title>{% apply trim %}{% block title %}{{ partdb_title}}{% endblock %}{% endapply %}</title>