Advertise places for getting help

[To1ne]

Make it easier for people to reach out for help. We have https://git-scm.com/community but it's a dull page and I'm pretty sure many people didn't find the Discord link there.

Also should we enable professional services to advertise themselves?

[To1ne]

Shall we add Discord to the footer on all pages?

Same for reddit?

[dscho]

@To1ne good ideas!

[To1ne]

good ideas!

Bad execution.