Update Font Awesome version in Admin panel

The current Font Awesome version in the admin panel is 4.4.0.

I updated this to the latest free version 6.6.0 here https://github.com/FortAwesome/Font-Awesome

I checked and all icons look to be loading properly in the admin panel. I also checked each of the built-in themes to make sure nothing was conflicting, and I didn't notice any missing icons in the themes.

.gitignore

@@ -4,3 +4,4 @@
 /config/users/*.ini
 /backup
 /.htaccess
+.DS_Store

system/admin/editor/js/Markdown.Editor.js

@@ -1524,7 +1524,7 @@
             buttons.readmore = makeButton("wmd-readmore-button", getString("readmore"), "fa fa-arrow-right", bindCommand("doReadMore"));
             buttons.toc = makeButton("wmd-toc-button", getString("toc"), "fa fa-list-alt", bindCommand("doTOC"));
             //makeSpacer(3);
-            buttons.undo = makeButton("wmd-undo-button", getString("undo"), "fa fa-undo", null);
+            buttons.undo = makeButton("wmd-undo-button", getString("undo"), "fa-solid fa-rotate-left", null);
             buttons.undo.execute = function (manager) {
                 if (manager) manager.undo();
             };
@@ -1533,7 +1533,7 @@
                 getString("redo") :
                 getString("redomac"); // mac and other non-Windows platforms
 
-            buttons.redo = makeButton("wmd-redo-button", redoTitle, "fa fa-repeat", null);
+            buttons.redo = makeButton("wmd-redo-button", redoTitle, "fa-solid fa-rotate-right", null);
             buttons.redo.execute = function (manager) {
                 if (manager) manager.redo();
             };

system/admin/views/layout.html.php

@@ -6,7 +6,8 @@
     <title><?php echo $title;?></title>
     <meta name="description" content="<?php echo $description; ?>"/>
     <link rel="canonical" href="<?php echo $canonical; ?>" />
-    <link rel="stylesheet" href="<?php echo site_url() ?>system/resources/css/font-awesome.css">
+    <link rel="stylesheet" href="<?php echo site_url() ?>system/resources/css/fontawesome.min.css">
+    <link rel="stylesheet" href="<?php echo site_url() ?>system/resources/css/solid.min.css">
     <link href="<?php echo site_url() ?>system/resources/css/adminlte.min.css" rel="stylesheet">
     <link href="https://fonts.googleapis.com/css?family=Source+Sans+Pro:300,400,400i,700" rel="stylesheet">
     <script src="<?php echo site_url() ?>system/resources/js/jquery.min.js"></script>
@@ -75,7 +76,7 @@
                with font-awesome or any other icon font library -->
           <li class="nav-item">
             <a href="<?php echo site_url();?>admin/content" class="nav-link">
-              <i class="nav-icon fa fa-th"></i>
+              <i class="nav-icon fa-solid fa-square-plus"></i>
               <p>
                 <?php echo ucwords(i18n('Add_content')); ?>
               </p>

system/resources/css/solid.min.css

@@ -0,0 +1,6 @@
+/*!
+ * Font Awesome Free 6.6.0 by @fontawesome - https://fontawesome.com
+ * License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License)
+ * Copyright 2024 Fonticons, Inc.
+ */
+:host,:root{--fa-style-family-classic:"Font Awesome 6 Free";--fa-font-solid:normal 900 1em/1 "Font Awesome 6 Free"}@font-face{font-family:"Font Awesome 6 Free";font-style:normal;font-weight:900;font-display:block;src:url(../webfonts/fa-solid-900.woff2) format("woff2"),url(../webfonts/fa-solid-900.ttf) format("truetype")}.fa-solid,.fas{font-weight:900}