Update fontawesome, fix external-link icon

docs/_includes/head.html

@@ -6,7 +6,7 @@
 <title>{{ page.title }} | {{ site.site_title }}</title>
 
 
-<link rel="stylesheet" type="text/css" href="assets/fontawesome-free-5.14.0-web/css/all.min.css">
+<link rel="stylesheet" type="text/css" href="assets/fontawesome-free-5.15.4-web/css/all.min.css">
 <link rel="stylesheet" type="text/css" href="assets/bootstrap-4.5.2-dist/css/bootstrap.min.css">
 
 <link rel="stylesheet" type="text/css" href="css/syntax.css">

docs/assets/README.md

@@ -4,7 +4,7 @@
 
 Doc: https://fontawesome.com/how-to-use/on-the-web/setup/hosting-font-awesome-yourself
 
-Download: https://use.fontawesome.com/releases/v5.14.0/fontawesome-free-5.14.0-web.zip
+Download: https://use.fontawesome.com/releases/v5.15.4/fontawesome-free-5.15.4-web.zip
 
 ## Bootstrap
 

docs/assets/fontawesome-free-5.15.4-web/webfonts/fa-regular-400.svg

@@ -1,16 +1,12 @@
 <?xml version="1.0" standalone="no"?>
-<!--
-Font Awesome Free 5.14.0 by @fontawesome - https://fontawesome.com
-License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License)
--->
 <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd" >
 <svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" version="1.1">
 <metadata>
-Created by FontForge 20200314 at Wed Jul 15 11:59:40 2020
+Created by FontForge 20201107 at Wed Aug  4 12:25:29 2021
  By Robert Madole
 Copyright (c) Font Awesome
 </metadata>
-<defs>
+<!-- Font Awesome Free 5.15.4 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) --><defs>
 <font id="FontAwesome5Free-Regular" horiz-adv-x="512" >
   <font-face 
     font-family="Font Awesome 5 Free Regular"

docs/assets/fontawesome-free-5.15.4-web/webfonts/fa-solid-900.svg

@@ -1,16 +1,12 @@
 <?xml version="1.0" standalone="no"?>
-<!--
-Font Awesome Free 5.14.0 by @fontawesome - https://fontawesome.com
-License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License)
--->
 <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd" >
 <svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" version="1.1">
 <metadata>
-Created by FontForge 20200314 at Wed Jul 15 11:59:41 2020
+Created by FontForge 20201107 at Wed Aug  4 12:25:29 2021
  By Robert Madole
 Copyright (c) Font Awesome
 </metadata>
-<defs>
+<!-- Font Awesome Free 5.15.4 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) --><defs>
 <font id="FontAwesome5Free-Solid" horiz-adv-x="512" >
   <font-face 
     font-family="Font Awesome 5 Free Solid"
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