refactor: update devcontainer and Biome configuration (#27)

- Remove ESLint and Prettier in favor of Biome
- Configure Biome as default formatter for TS/JS/JSON/MD
- Add development helper extensions
- Update VSCode settings for Biome integration

Closes #27

.devcontainer/build-and-push.sh

@@ -0,0 +1,28 @@
+#!/bin/bash
+
+# Configuration
+GITHUB_USERNAME=$1
+IMAGE_NAME="finance-devcontainer"
+IMAGE_TAG="latest"
+
+if [ -z "$GITHUB_USERNAME" ]; then
+    echo "Usage: $0 <github_username>"
+    echo "Example: $0 acedanger"
+    exit 1
+fi
+
+FULL_IMAGE_NAME="ghcr.io/$GITHUB_USERNAME/$IMAGE_NAME:$IMAGE_TAG"
+
+# Build the image
+echo "Building image: $FULL_IMAGE_NAME"
+docker build -t $FULL_IMAGE_NAME -f Dockerfile .
+
+# Push to GitHub Container Registry
+echo "Pushing image to GHCR..."
+docker push $FULL_IMAGE_NAME
+
+echo "Done! Now update your devcontainer.json to use this image:"
+echo "Replace the 'build' section with:"
+echo '{
+  "image": "'$FULL_IMAGE_NAME'"
+}'