Adapting the bot for multiple discord servers.

[CyaOnDaNet]

I updated the dependencies and added your github repository to the package.json so there are 0 vulnerabilities reported at this time. Added ability to change prefix in discord. Added a help command in discord. Added the ability to have separate discord server settings by storing prefixes in a sqlite database (I plan on adding more server/bot customization later with the database). I removed some unnecessary plex and bot configuration requirements. Lastly, I updated the README.md to reflect my changes.