Suppress Python start page

Author: GraemeMalcolm

.devcontainer/devcontainer.json

@@ -14,6 +14,7 @@
     "python.linting.enabled": true,
     "python.linting.pylintEnabled": true,
     "python.linting.pylintPath": "/opt/conda/bin/pylint",
-    "python.dataScience.alwaysTrustNotebooks":true
+    "python.dataScience.alwaysTrustNotebooks":true,
+    "python.showStartPage": false
   },
 }