Sync mergify with play itsefl

Author: ignasi35

.mergify.yml

@@ -12,22 +12,14 @@ pull_request_rules:
       merge:
         method: merge
 
-  - name: Delete the PR branch after merge
+  - name: Delete the PR branch and remove label after merge
     conditions:
       - merged
     actions:
       delete_head_branch: {}
       label:
         remove: [ "status:merge-when-green" ]
 
-  - name: auto add wip
-    conditions:
-      # match a few flavours of wip
-      - title~=^(\[wip\]( |:) |\[WIP\]( |:) |wip( |:) |WIP( |:)).*
-    actions:
-      label:
-        add: ["status:block-merge"]
-
   - name: Labeling for Scala Steward PR's
     conditions:
       - author=scala-steward