docs: upgrade fontawesome to v6

Also update the Filescom icon.

docs/layouts/_default/baseof.html

@@ -11,7 +11,9 @@
     <title>{{ block "title" . }}{{ .Title }}{{ end }}</title>
     <link rel="canonical" href="{{ .Permalink }}">
     <link href="/css/bootstrap.min.4.4.1.css" rel="stylesheet">
-    <link href="/css/font-awesome.min.5.10.2.css" rel="stylesheet">
+    <link href="/fontawesome/css/fontawesome.min.css" rel="stylesheet">
+    <link href="/fontawesome/css/brands.min.css" rel="stylesheet">
+    <link href="/fontawesome/css/solid.min.css" rel="stylesheet">
     <link href="/css/custom.css?r={{ .Date.Unix }}" rel="stylesheet">
     {{ $RSSLink := "" }}{{ with .OutputFormats.Get "RSS" }}{{ $RSSLink = .RelPermalink }}{{ end }}{{ if $RSSLink }}<link href="{{ $RSSLink }}" rel="alternate" type="application/rss+xml" title="{{ .Site.Title }}" />{{ end }}
   </head>

docs/layouts/chrome/navbar.html

@@ -65,7 +65,7 @@
           <a class="dropdown-item" href="/koofr/#digi-storage"><i class="fa fa-cloud fa-fw"></i> Digi Storage</a>
           <a class="dropdown-item" href="/dropbox/"><i class="fab fa-dropbox fa-fw"></i> Dropbox</a>
           <a class="dropdown-item" href="/filefabric/"><i class="fa fa-cloud fa-fw"></i> Enterprise File Fabric</a>
-          <a class="dropdown-item" href="/filescom/"><i class="fa fa-file-alt fa-fw"></i> Files.com</a>
+          <a class="dropdown-item" href="/filescom/"><i class="fa fa-brands fa-files-pinwheel fa-fw"></i> Files.com</a>
           <a class="dropdown-item" href="/ftp/"><i class="fa fa-file fa-fw"></i> FTP</a>
           <a class="dropdown-item" href="/gofile/"><i class="fa fa-folder fa-fw"></i> Gofile</a>
           <a class="dropdown-item" href="/googlecloudstorage/"><i class="fab fa-google fa-fw"></i> Google Cloud Storage</a>