Infrastructure diagram

[Himan10]

This contains diagram of the following pointers:

1. how our existing set-up is running on AWS.
2. AWS services we use
3. How we have done the hosting
4. How to scale (just discussion, not scaling it as of now)

[Himan10]

https://link.excalidraw.com/l/7hfT8dpFOIH/9H914oDG0cP

@ehayushpathak @Ephemaral
Existing AWS infra diagram here. Suggest changes as well.