Set up user onboading

[youngbryanyu]

Backend

• Move mongoDB to its own client class
• Create firebase client
• Create middleware to verify JWT tokens
• Create APIs for user info
• Move rate limiting to its own test files (separate successful calls from routes tests)
• Update PUT api to check for timestamp
• Set up indexes for users API
• Update backend documentation
• Update HTTP requests to not have unncessary messages
• Update healthCheck API (add firebase, redis ping)

Frontend

• Finalize macro goal calculating formula (may require tweaking accepted values in backend)
• Create feature for setting up user (onboarding)
• Clean up code (implement TODOs)
• Set up background processes / retries for 500 errors
• Create feature for allowing manual macro setting
• Clean up code
• Test manually
• Update frontend documentation
• Clean up frontend code