feat: Add Biome configuration and update project settings for improved development experience. adds devcontainer to satisfy #14

.devcontainer/devcontainer.json

@@ -0,0 +1,42 @@
+{
+  "name": "Finance App Development",
+  "image": "mcr.microsoft.com/devcontainers/typescript-node:1-20-bullseye",
+  "features": {
+    "ghcr.io/devcontainers/features/git:1": {}
+  },
+  "customizations": {
+    "vscode": {
+      "extensions": [
+        "astro-build.astro-vscode",
+        "biomejs.biome-vscode",
+        "GitHub.copilot",
+        "GitHub.copilot-chat",
+        "ms-vscode.vscode-typescript-next",
+        "bradlc.vscode-tailwindcss"
+      ],
+      "settings": {
+        "editor.formatOnSave": true,
+        "editor.defaultFormatter": "biomejs.biome-vscode",
+        "[astro]": {
+          "editor.defaultFormatter": "astro-build.astro-vscode"
+        },
+        "editor.codeActionsOnSave": {
+          "source.organizeImports.biome": true,
+          "quickfix.biome": true
+        },
+        "typescript.updateImportsOnFileMove.enabled": "always",
+        "editor.bracketPairColorization.enabled": true,
+        "files.exclude": {
+          "**/.git": true,
+          "**/.DS_Store": true,
+          "**/node_modules": true,
+          "**/.idea": true
+        },
+        "terminal.integrated.defaultProfile.linux": "bash"
+      }
+    }
+  },
+  "forwardPorts": [3000],
+  "postCreateCommand": "npm install",
+  "remoteUser": "node"
+}