Docs: Update AWS Self Hosting Guide

[wh1337]

I would like to update the docs for AWS self-hosting with the following:

• Installing on a EC2 instance
• Connecting to AWS Document DB
• Connecting to AWS ElasticCache
• Reverse Proxy

If you can assign this task to me, I will write the docs up for your review. We are about to re-deploy Novu to our VPC and I plan to document the journey and would like to share it with the community.

[unicodeveloper]

Done @wh1337 !

[jainpawan21]

@wh1337

Are you still interested to work on this?

[wh1337]

@jainpawan21 I am, I was waiting on when we updated to v2.0 that way I can write it based on the latest stuff