Fix devcontainer websocket/port issues, update/add npm scripts

.devcontainer/Dockerfile

@@ -1,7 +1,7 @@
 FROM node:18
 
 # Install some apt packages
-RUN apt-get update && apt-get install -y sudo zsh git vim tmux
+RUN apt-get update && apt-get install -y sudo zsh git vim tmux lsof
 
 # Variable for default user `node` to be used in the following steps
 ARG USERNAME=node

.devcontainer/devcontainer.json

@@ -15,7 +15,12 @@
 	]
   },
   "forwardPorts": [3000],
+  "portsAttributes": {
+    "3000": {
+      "label": "React Dev Server",
+      "onAutoForward": "notify"
+    }
+  },
   "postCreateCommand": "npm install",
   "remoteUser": "node"
 }
-