Feature: Setting a rate limit on the endpoints using flask limiter

**Is your feature request related to a problem? Please describe.**

Heroku Does offer DDoS mitigation however, according to [this](https://help.heroku.com/HCCDCDYY/does-heroku-offer-ddos-denial-of-service-mitigation) post they strongly recommend using a rate limiter library.

**Describe the solution you'd like**

Rate limit the endpoints of the api using [flask limiter](https://flask-limiter.readthedocs.io/en/stable/).

**Additional context**

The time and amount of requests that should be allowed should be discussed, possibly in the mentorship session.