List of changes and improvements.

• Remove unused packages
• Add gitignore
• Separate the app and server due to best practices for integration tests
• Add eslint files
• Linting project
• Remove duplicate middleware usage on simulator.router
• Define DB connection
• Refactor config file based on dotenv module
• Refactor mongoose models
• Refactor seed script
• Define types for each model in ./types
• Set project hierarchy like bulletproof Node.js architecture
• Move /api from every route to entry point. Also it's best practice to change /api to /v1. The api endpoint versioning and prevent redundant url segment.
• Reformat API routers base on API best practices like: /profile to /profiles or /favorites/:profileId to /favorites/profile/:profileId
• Install joi to validate user inputs
• Set a error catcher middleware
• Set a response model on express response
• Set a logging strategy

• We need authentication for app
• We need to sanitize the inputs for XSS and SQL injection attacks
• Shipping logs to log manager
• Setting and gathering application statuses