provide an option to show or not show github profile link

.themes/classic/source/_includes/asides/github.html

@@ -4,6 +4,9 @@
   <ul id="gh_repos">
     <li class="loading">Status updating...</li>
   </ul>
+  {% if site.github_show_profile_link %}
+  <a href="https://github.com/{{site.github_user}}">@{{site.github_user}}</a> on Github
+  {% endif %}
   <script type="text/javascript">
     $.domReady(function(){
         if (!window.jXHR){

_config.yml

@@ -58,6 +58,7 @@ twitter_tweet_button: true
 # github repositories
 github_user:
 github_repo_count: 0
+github_show_profile_link: true
 
 # Google Plus
 google_plus_one: true