chore(devcontainer): remove the broken setup (#56126)

.devcontainer/devcontainer.json

@@ -1,24 +0,0 @@
-{
-  "customizations": {
-    "vscode": {
-      "extensions": [
-        "dbaeumer.vscode-eslint",
-        "esbenp.prettier-vscode",
-        "freeCodeCamp.freecodecamp-dark-vscode-theme"
-      ]
-    }
-  },
-  "dockerFile": "Dockerfile",
-  "forwardPorts": [3000, 8000, 27017],
-  "portsAttributes": {
-    "8000": {
-      "label": "Learn",
-      "onAutoForward": "openPreview"
-    }
-  },
-  "postCreateCommand": "cp sample.env .env && npm ci",
-  // It is more reliable to start these processes oneself
-  // "postStartCommand": "mongod &",
-  // "postAttachCommand": "npm run develop",
-  "workspaceFolder": "/workspaces/${localWorkspaceFolderBasename}"
-}