github: Remove stalebot config

Remove the stalebot config file as we now have a centralised version of
it that can apply to all repos:

- https://github.com/kata-containers/.github/blob/master/.github/stale.yml

Fixes #556.

Signed-off-by: James O. D. Hunt <james.o.hunt@intel.com>

.github/stale.yml

@@ -1,53 +0,0 @@
-# Configuration for probot-stale - https://github.com/probot/stale
-
-# Number of days of inactivity before an Issue or Pull Request with the stale label is closed.
-# Set to false to disable. If disabled, issues still need to be closed manually, but will remain marked as stale.
-daysUntilClose: 7
-
-# Set to true to ignore issues in a project (defaults to false)
-exemptProjects: false
-
-# Set to true to ignore issues in a milestone (defaults to false)
-exemptMilestones: false
-
-# Set to true to ignore issues with an assignee (defaults to false)
-exemptAssignees: false
-
-# Label to use when marking as stale
-staleLabel: stale
-
-# Comment to post when removing the stale label.
-# unmarkComment: >
-
-closeComment: >
-This issue/pull request has been automatically closed due to inactivity and no response to the auto close bot
-request. If you feel this is inappropriate, please respond to this issue requesting it to be re-opened. 
-
-# Limit the number of actions (marking or closing issues/PRs) per hour, from 1-30. Default is 30
-limitPerRun: 30
-
-# Issue specific handling:
-issues:
-  daysUntilStale: 60
-  markComment: >
-    This issue has been automatically marked as stale because it has not had
-    recent activity. It will be closed if no further activity occurs. Thank you
-    for your contributions.
-   exemptLabels:
-     - limitation
-     - security
-     - P1
-
-# Pull request specific handling:
-pulls:
-  daysUntilStale: 30
-  markComment: >
-    This pull request has been automatically marked as stale because it has not had
-    recent activity. It will be closed if no further activity occurs. See [assisted pr workflow](https://github.com/kata-containers/community/blob/master/CONTRIBUTING.md#assisted-pr-workflow)
-    if any developers would like to help pickup this pull request.  Thank you for your contributions.
-  exemptLabels:
-    - pinned
-    - security
-    - release-gating
-    - P1
-