Add complete Government Travel Cost Estimator web application

Co-authored-by: mblanke <9078342+mblanke@users.noreply.github.com>

.gitignore

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+# Dependencies
+node_modules/
+package-lock.json
+
+# Configuration (contains API keys)
+config.local.js
+
+# Build artifacts
+dist/
+build/
+*.min.js
+*.min.css
+
+# IDE
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Logs
+*.log
+npm-debug.log*
+
+# Testing
+coverage/
+.nyc_output/
+
+# Temporary files
+tmp/
+temp/
+*.tmp