Add dotenv/ngork instructions to the README.md to help with testing on local machine

[stucamp]

Probably need to add a blurb on how to set up the .env file (in the src directory) so that people can set it up to work on their own local testing env and development slack workspace. Also, include the ngrok instructions allowing people to host the bot on their machine using a proxy endpoint.

• Deeper dotenv instructions
• Deeper ngork instructions

[bananabrann]

Should have asked this on the meeting - What's your thoughts on Docker-izing the bot for local serving?

[stucamp]

the issue is gonna be that the slack events api requires an endpoint with ssl... which means that most people are gonna have a hard time getting such a test endpoint set up on their home network... ngrok essentially provides that endpoint for you and then pipes it back to localhost:port... bypassing the need to mince with your local router/firewall configs

[stucamp]

May be able to set up docker in conjunction with ngrok though...🤔