Set stale.yml config

.github/stale.yml

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+# Configuration for probot-stale - https://github.com/probot/stale
+
+# Limit to only `issues`
+only: issues
+
+# Number of days of inactivity before an Issue or Pull Request is closed.
+# Set to false to disable. If disabled, issues still need to be closed manually, but will remain marked as stale.
+daysUntilClose: 14
+
+# Issues or Pull Requests with these labels will never be considered stale. Set to `[]` to disable
+exemptLabels:
+  - bug
+  - "technical issues"
+
+# Comment to post when marking as stale. Set to `false` to disable
+markComment: false
+
+# Comment to post when closing a stale Issue or Pull Request.
+closeComment: >
+  This issue has been automatically closed since there has not been
+  any recent activity. Please open a new issue for related bugs.
+
+# Limit the number of actions per hour, from 1-30. Default is 30
+limitPerRun: 30