Stale bot to set an APE as abandoned

[pllim]

As laid out in APE 1 following:

• Update APE process to have PRs be only for editorial review #115

[neutrinoceros]

(would be a nice "sub-issue" but it looks like we don't have this GH feature yet on this repo)

[pllim]

#124 (comment)

@neutrinoceros could you please clarify? What exactly should be a sub-issue? Thanks!

[neutrinoceros]

I meant that this could be a sub-issue to #115.
Nevermind, #115 is really a PR, so that wouldn't even work. Would you have any spare change for the coffee machine ?