update overallw workflow

Author: DininduSenanayake

docs/index.md

@@ -5,7 +5,7 @@
 Deploy APSIM (Agricultural Production Systems sIMulator - https://www.apsim.info/) on high performance computing clusters.
 
 <center>
-![image](./images/overall.png)
+![image](./images/2_overall.png)
 </center>
 
 ## 1. Apptainer build
@@ -172,4 +172,4 @@ Deploy APSIM (Agricultural Production Systems sIMulator - https://www.apsim.info
             - A new shell process is created to run the script.
             - Any changes to the working directory (`cd` commands) only affect this subshell.
             - Once the script finishes, the subshell terminates, and you return to your original shell with its original working directory unchanged.
-            
+