some (possibly cool) stuff

[ZakaHaceCosas]

can't think of anything else to add in so i guess i'll PR this now and if i get any idea PR it separately

cool changes:

• added ability to show an invite to your server on serverboard, lets you set a channel, or defaults to rules channel
• added humanizeSettings() which makes settings easier to read (not just replacing "_" with " ", but making more changes)

fixes:

• fixed a discord.js deprecation
• fix typos
• remove instagram link (sokora has no instagram profile anymore)
• fix TS thinking capitalize could return undefined

normal changes:

• added timestamp to message edit and message delete events
• added basic code style guidelines to CONTRIBUTING.md (based on what current code looks like)
• use genColor() instead of fixed green for math embeds
• remove roles option from serverEmbed since it's always true anyway
• to ensure people who run prettier don't fill up the diff, prettier config file now uses ES5 trailing comma

[MrSerge01]

LGTM,
- The Goos.