feat: refactor for freecodecamp-os@3 (#194)

Author: ShaunSHamilton

.devcontainer/devcontainer.json

@@ -3,13 +3,17 @@
     "vscode": {
       "extensions": [
         "dbaeumer.vscode-eslint",
-        "freeCodeCamp.freecodecamp-courses@1.1.1",
+        "freeCodeCamp.freecodecamp-courses@3.0.0",
         "freeCodeCamp.freecodecamp-dark-vscode-theme"
       ]
     }
   },
   "forwardPorts": [8080],
-  "workspaceFolder": "/home/camper/curriculum",
+  "workspaceFolder": "/workspace/euler-rust",
   "dockerFile": "../Dockerfile",
-  "context": ".."
+  "context": "..",
+  "updateRemoteUserUID": false,
+  "remoteUser": "gitpod",
+  "containerUser": "gitpod",
+  "postCreateCommand": "node tooling/adjust-url.js"
 }