Enable the GitHub app Stale bot to clear the outdated issues

Signed-off-by: Steven Zou <szou@vmware.com>

.github/ISSUE_TEMPLATE/issue_template.md

@@ -1,17 +0,0 @@
-If you are reporting a problem, please make sure the following information are provided:
-
-**Expected behavior and actual behavior:**
-A clear and concise description of what you expected to happen and what's the actual behavior. If applicable, add screenshots to help explain your problem.
-
-**Steps to reproduce the problem:**
-Please provide the steps to reproduce this problem.
-
-**Versions:**
-Please specify the versions of following systems.
-- harbor version: [x.x.x]
-- docker engine version: [y.y.y]
-- docker-compose version: [z.z.z]
-
-**Additional context:**
-* **Harbor config files:** You can get them by packaging `harbor.cfg` and files in the same directory, including subdirectory.
-* **Log files:** You can get them by package the `/var/log/harbor/` .

.github/ISSUE_TEMPLATE/proposal_template.md

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-**Is your feature request related to a problem? Please describe.**
-A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
-
-**Describe the solution you'd like**
-A clear and concise description of what you want to happen.
-
-**Describe the main design/architecture of your solution**
-A clear and concise description of what does your solution look like. Rich text and diagrams are preferred.
-
-**Describe the development plan you've considered**
-A clear and concise description of the plan to make the solution ready. It can include a development timeline, resource estimation, and other related things.
-
-**Additional context**
-Add any other context or screenshots about the feature request here.

.github/stale.yml

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+# Number of days of inactivity before an issue becomes stale
+daysUntilStale: 60
+# Number of days of inactivity before a stale issue is closed
+daysUntilClose: 7
+# Issues with these labels will never be considered stale
+exemptLabels:
+  - backlog
+# Label to use when marking an issue as stale
+staleLabel: wontfix
+# Comment to post when marking an issue as stale. Set to `false` to disable
+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.
+# Comment to post when closing a stale issue. Set to `false` to disable
+closeComment: false