Add extensions to top level of devcontainer

Author: Robinlovelace

.devcontainer.json

@@ -1,16 +1,10 @@
 {
     "image": "ghcr.io/geocompx/python",
     // "forwardPorts": [3000],
-    "customizations": {
-      // Configure properties specific to VS Code.
-      "vscode": {
-        // Add the IDs of extensions you want installed when the container is created.
-        "extensions": [
-          "quarto.quarto",
-          "ms-python.vscode-pylance",
-          "ms-python.python",
-          "ms-toolsai.jupyter"
-        ]
-      }
-    }
-  }
+    "extensions": [
+        "quarto.quarto",
+        "ms-python.vscode-pylance",
+        "ms-python.python",
+        "ms-toolsai.jupyter"
+    ]
+}