Remove discordtipbot

[greenbigfrog]

There's no point in having this listed here.
It's also a outdated version.

[straight-shoota]

Why do you think there's no point?
Outdated shards should usually just be marked as state: archived.

[greenbigfrog]

Should've elaborated.
greenbigfrog/discordtipbot is now succeeded by the combination of https://github.com/greenbigfrog/tipbot-common , https://github.com/greenbigfrog/tipbot-discord/ , https://github.com/greenbigfrog/tipbot-twitch and https://github.com/greenbigfrog/tipbot-main
I guess setting greenbigfrog/discordtipbot and adding one of the others would be a option.
I'll probably move the repos to a org sometime soonish, and also there's some unpushed changes in the main repo with explanation/guides.