4 pane comic of dolan on the left and spooderman on the right
pane 1 (dolan): cum join opensurce cummunity!
pane 2 (spooderman): shure! how joyn?
pane 3 (dolan): Here discord! (with discord logo)
pane 4 (spooderman with tears in eyes): y u do dis?
Can't you do everything you've listed on github though? Report bugs on issues tab, ask questions on discussions tab, following up is easy. Everything is also indexed by search engines and can be looked up later on.
I know, but this thread is about projects that don't want to use GitHub as the center of discussion and use Discord instead. The Discussion tab need to be enabled.