diff --git a/Gemfile b/Gemfile
index 37f5eaa..053c27d 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,2 +1,2 @@
 source 'https://rubygems.org'
-gem 'github-pages', group: :jekyll_plugins
+gem 'github-pages'
diff --git a/_site/computer-science-blog/index.html b/_site/computer-science-blog/index.html
index e4d9182..476fb9e 100644
--- a/_site/computer-science-blog/index.html
+++ b/_site/computer-science-blog/index.html
@@ -169,6 +169,8 @@
 </div>
 <!-- HTML basics info is inserted via jQuery -->
 <div id="blog-insert"></div>
+<p><br /></p>
+<center>Made in association with Daniel Dunbar</center>
 
                     <!-- link to source code on GitHub -->
                     <a href="https://github.com/mgrove36/demo-code/tree/master/computer-science-blog/" class="source-code-link mdc-fab mdc-fab--extended" data-mdc-auto-init="MDCRipple">
diff --git a/_site/index_old.html b/_site/index_old.html
deleted file mode 100644
index 295e38c..0000000
--- a/_site/index_old.html
+++ /dev/null
@@ -1,82 +0,0 @@
-<!DOCTYPE html>
-<html>
-    <head>
-        <meta charset="utf-8">
-        <meta http-equiv="X-UA-Compatible" content="IE=edge">
-        <meta name="viewport" content="width=device-width, initial-scale=1,minimum-scale=1.0,maximum-scale=1.0,user-scalable=no">
-        <meta name="HandheldFriendly" content="True">
-        <link rel="icon" sizes="192x192" href="https://matthew-grove.ml/logo.png">
-
-        <!-- add to homescreen for Chrome on Android -->
-        <meta name="mobile-web-app-capable" content="yes">
-        <link rel="icon" sizes="192x192" href="https://matthew-grove.ml/logo.png">
-
-        <!-- add to homescreen for Safari on iOS -->
-        <meta name="apple-mobile-web-app-capable" content="yes">
-        <meta name="apple-mobile-web-app-status-bar-style" content="black">
-        <meta name="apple-mobile-web-app-title" content="Luhn Algorithm | Matthew Grove">
-        <link rel="apple-touch-icon-precomposed" href="https://matthew-grove.ml/logo.png">
-
-        <!-- tile icon & colour for Windows 8 -->
-        <meta name="msapplication-TileImage" content="https://matthew-grove.ml/logo.png">
-        <meta name="msapplication-TileColor" content="#d84315">
-
-        <title>Demo Site | Matthew Grove</title>
-        <meta name="description" content="Small coding projects - by Matthew Grove">
-
-        <!-- import Roboto (font) -->
-        <link href="/assets/roboto.css" rel="stylesheet" type="text/css">
-
-        <!-- import jQuery -->
-        <script src="/assets/jquery.min.js" type="text/javascript"></script>
-
-        <!-- import cookie JavaScript -->
-        <script src="/assets/cookies.js" type="text/javascript"></script>
-
-        <!-- import Material Design components & icons -->
-        <link href="/assets/material-components-web.min.css" rel="stylesheet" type="text/css">
-        <link href="/assets/material_icons.css" rel="stylesheet" type="text/css">
-        <script src="/assets/material-components-web.min.js" type="text/javascript"></script>
-
-        <!-- import local styling & scripts -->
-        <script src="/assets/global.js" type="text/javascript"></script>
-        <link href="/assets/global.css" rel="stylesheet" type="text/css">
-        <script src="script.js" type="text/javascript"></script>
-
-        <!-- Global site tag (gtag.js) - Google Analytics -->
-        <script async src="https://www.googletagmanager.com/gtag/js?id=UA-124505000-1" type="text/javascript"></script>
-        <script type="text/javascript">
-            window.dataLayer = window.dataLayer || [];
-            function gtag(){dataLayer.push(arguments);}
-            gtag('js', new Date());
-            gtag('config', 'UA-124505000-1');
-        </script>
-    </head>
-    <body>
-        <!-- cookie notice is included via jQuery -->
-        <div id="cookies"></div>
-
-        <!-- content of navbar is included via jQuery -->
-        <aside class="navbar-insert mdc-drawer mdc-drawer--modal"></aside>
-
-        <div class="mdc-drawer-scrim"></div>
-
-        <div class="mdc-drawer-app-content">
-            <header class="mdc-top-app-bar app-bar" id="app-bar"></header>
-
-            <main class="main-content" id="main-content">
-                <div class="mdc-top-app-bar--fixed-adjust">
-                    <p>
-                        This site contains code for small projects that I am doing; each project can be accessed via the navigation drawer.
-                        If you have any ideas for projects I could do, please leave them <a href="https://goo.gl/forms/qXO1cwSbE4FoQHdq2">here</a>.
-                    </p>
-                    <!-- link to source code on GitHub -->
-                    <a href="https://github.com/mgrove36/demo-code/blob/master/index.html" class="source-code-link mdc-fab mdc-fab--extended" data-mdc-auto-init="MDCRipple"></a>
-                </div>
-            </main>
-            <footer>
-                &copy; Matthew Grove 2018
-            </footer>
-        </div>
-    </body>
-</html>
diff --git a/computer-science-blog/index.md b/computer-science-blog/index.md
index dab4b21..9b2a198 100644
--- a/computer-science-blog/index.md
+++ b/computer-science-blog/index.md
@@ -65,3 +65,5 @@ layout: default
 </div>
 <!-- HTML basics info is inserted via jQuery -->
 <div id="blog-insert"></div>
+<br>
+<center>Made in association with Daniel Dunbar</center>
