Use openFiles instead of first-run-notice

.devcontainer/devcontainer.json

@@ -11,22 +11,16 @@
 			"settings": {
 				// Settings for the python extension.
 				"python.defaultInterpreterPath": "${workspaceFolder}/.venv",
-				"python.terminal.activateEnvInCurrentTerminal": true,
-				"python.linting.enabled": true,
-				"python.linting.pylintEnabled": true
-
-			},
-			// Installs extensions on container create.
-			"extensions": [
-				"ms-python.python",
-				"ms-python.vscode-pylance"
+				"python.terminal.activateEnvInCurrentTerminal": true
+			}
+		},
+		"codespaces": {
+			"openFiles": [
+				".devcontainer/welcome-message.txt"
 			]
 		}
 	},
 
-	// Displays a custom welcome message.
-	"onCreateCommand": "sudo cp .devcontainer/welcome-message.txt /usr/local/etc/vscode-dev-containers/first-run-notice.txt",
-
 	// Runs the initial setup commands after the container is created.
 	"postCreateCommand": "sudo chmod +x .devcontainer/post-create-command.sh && .devcontainer/post-create-command.sh"
 }