docs(codespaces): fixed welcome message

Author: jan-molak

.devcontainer/devcontainer.json

@@ -24,7 +24,7 @@
   },
   "postCreateCommand": {
     "Install": "npm ci",
-    "Welcome": "sudo cp .devcontainer/first-run-notice.txt /usr/local/etc/vscode-dev-containers/first-run-notice.txt"
+    "Welcome": "sudo cp .devcontainer/first-run-notice.txt /workspaces/.codespaces/shared/first-run-notice.txt"
   },
   "waitFor": "postCreateCommand",
   "postAttachCommand": {