Having newline between I think didn't apply the PR stale days setting of
30 properly (it was using 45)
And it seemd that unless I set the days-before-close to -1
intentionally, it would still close the Issue/PRs, as the default value
is 7 already.
Also updated version of the stale action to v8
* Remove old stale bot yaml file
* Remove slack svg file (unused)
* Stale action: Only apply stale label, and no other actions
Respecting the opinion on
https://github.com/PX4/PX4-Autopilot/commit/fa9ac6ecf651232f3105ca124a2d2c54ab8620d0,
it seems reasonable to disable commenting feature, and just keep the
action only applying the `stale` label. This will reduce the noise /
email spams / ping pong fight with the stale bot (Action)
Junwoo Hwang