Merge #2065

2065: Update stale bot with clearer message why an issue is marked stale. r=mergify[bot] a=Diman0

## What type of PR?

enhancement

## What does this PR do?
Update the message from stale bot to provide more info about 
- why the issue is marked stale
- after how many days it is marked stale
- when the issue will be closed automatically
- how to remove the stale label.
- stalebot only acts upon user support issues (issues with a label are excluded). Explain how to reach the matrix channel for user support.

### Related issue(s)
- #1582 

## Prerequisites
Before we can consider review and merge, please make sure the following list is done and checked.
If an entry in not applicable, you can check it or remove it from the list.

- [n/a] In case of feature or enhancement: documentation updated accordingly
- [n/a] Unless it's docs or a minor change: add [changelog](https://mailu.io/master/contributors/workflow.html#changelog) entry file.


Co-authored-by: Dimitri Huisman <diman@huisman.xyz>

.github/stale.yml

@@ -24,7 +24,7 @@ exemptLabels:
   - type/security
 
 # Set to true to ignore issues in a project (defaults to false)
-exemptProjects: false
+exemptProjects: true
 
 # Set to true to ignore issues in a milestone (defaults to false)
 exemptMilestones: true
@@ -36,10 +36,14 @@ exemptAssignees: true
 staleLabel: status/response_needed
 
 # Comment to post when marking 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.
+markComment: |
+  Issues not for bugs, enhancement requests or discussion go stale after 21 days of inactivity. This issue will be automatically closed after 14 days.
+  For all metrics refer to the [stale.yml file](https://github.com/Mailu/Mailu/blob/master/.github/stale.yml).
+  Github issues are not meant for user support. For **user-support questions**, reach out  on the [matrix support channel](https://matrix.to/#/#mailu:tedomum.net).
+
+  Mark the issue as fresh by simply adding a comment to the issue.
+  If this issue is safe to close, please do so now.
+
 
 # Comment to post when removing the stale label.
 # unmarkComment: >
@@ -47,9 +51,8 @@ markComment: >
 
 # Comment to post when closing a stale Issue or Pull Request.
 closeComment: >
-  This issue has not seen activity since as it has become stale. It will now be
-  automatically closed. Please note that this is an automatic action, and not
-  meant in any offensive way.
+  This issue has not seen activity since as it has become stale.
+  Stale issues are automatically closed after 14 days.
 
 # Limit the number of actions per hour, from 1-30. Default is 30
 limitPerRun: 30