Refactor a bunch of things

This bot is getting kinda messy, let's clean it up a bit

Changes

[x] Added dotenv dependency for better configuration using .env files
[x] Removed config.json and data.json
[x] Replaced references to config/data with process.env.<VARIABLE_NAME>
[x] Added .env.example - copy this to .env and fill in the options for quicker setup (please use this for all future config options)
[x] Added start npm command, can now launch the app with npm start
[x] Removed example test command
[x] Renamed main.js to index.js
[x] Added triggers module which allows for better modularity with !commands
[x] Refactor all commands into triggers
[x] Move logic for translations outside of message event listener
[x] Remove usage of mz/fs - not really sure why we needed it in the first place
[x] Added a function for getting metaData easily in any module/trigger
[x] !help should now include all triggers unless configured to do so
[x] Added CONTRIBUTING.md with examples on how to create modules and triggers
[x] Moved contribution information from README.md to CONTRIBUTING.md
[x] Add minimum Node version (>14) to package.json