Remove unnecessary postCreateCommand

We no longer need to copy these files over as of #6.

Author: shati-patel

.devcontainer/devcontainer.json

@@ -10,6 +10,5 @@
       "openFiles": ["README.md"]
     }
   },
-  "onCreateCommand": "bash .devcontainer/onCreateCommand.sh",
-  "postCreateCommand": "bash .devcontainer/postCreateCommand.sh"
+  "onCreateCommand": "bash .devcontainer/onCreateCommand.sh"
 }