3.1.0: Remove Magic Mongo & more

• Remove example bot
  • It was so useless and just made the project structure confusing
• Add LazyEmbed#getFields()
• Remove Magic Mongo
  • It should be declared per-bot instead of forcing it for every bot (not all bots need it)
• Add more pre-built static embeds
• Bump version (3.1.0)
• Replace getSettings() with setSettings()

Full Changelog: 3.0.1...3.1.0