minor refactory

Author: sdutta9

labs/lab0/readme.md

@@ -78,7 +78,7 @@ Look for an email from **`[email protected]`**. This will have instructi
 
   ### OPTION 1: Using **Apache Guacamole**
 
-  ![Apache Guacamole](media/Apache_Guacamole.png)
+  ![Apache Guacamole](media/apache_guacamole.png)
 
   This workshop is enabled with Apache Guacamole, which is a clientless remote desktop gateway.