Update devcontainer configuration for new setup

.devcontainer/devcontainer.json

@@ -1,14 +1,22 @@
 {
-    "name": "Monochrome Dev Container",
+    "name": "debian-npm-fish-devcontainer",
     "build": {
-        "context": "..",
-        "dockerfile": "./Dockerfile"
+        "dockerfile": "Dockerfile"
     },
-    "postCreateCommand": "git config --local core.editor \"code --wait\" && git config --local commit.gpgsign false && npm install && bun install",
+
+    "remoteUser": "devuser",
+
+    "features": {},
+
     "customizations": {
         "vscode": {
             "extensions": ["dbaeumer.vscode-eslint", "esbenp.prettier-vscode"]
         }
     },
-    "mounts": ["source=${env:HOME}/.gitconfig,target=/home/vscode/.gitconfig,type=bind,consistency=cached"]
+
+    "postCreateCommand": "npm install",
+
+    "remoteEnv": {
+        "SHELL": "/usr/bin/fish"
+    }
 }