new icons for live demo

configuration.md

@@ -46,7 +46,7 @@ If there are 2 files named `id_rsa`, you have an SSH key.
 <br><br>
 If you don’t have yet an SSH key, you have to generate one:
 ```bash
-$ ssh-keygen -t rsa -b 4096
+$ ssh-keygen -t rsa # -b 4096
 ```
 
 <br>

github_gitlab.md

@@ -12,7 +12,7 @@ Positive point: GitHub and GitLab are (almost) the same.
 
 ## GitHub
 
-[www.github.com](www.github.com)
+[https://github.com](https://github.com)
 <br><img src="https://assets-cdn.github.com/images/modules/logos_page/GitHub-Mark.png" alt="GitHub" style="width: 200px;"/>
 
 <div class="fragment">