chore: unfreeze main branch (backport #3560) (#3561)

Co-authored-by: Mark McCulloh <[email protected]>

.mergify.yml

@@ -28,45 +28,31 @@ pull_request_rules:
       - "#review-threads-unresolved=0"
       - -approved-reviews-by~=author
       - check-success=Validate PR title
-      - or:
-        -  base=main
-        -  base=dev
-      - or:
-        # Code freeze at 7am utc July 13th 2023
-        - updated-at<=2023-07-13T07:00:00Z
-        - base=dev
+      - base=main
       - or:
         - check-success=Quality Gate
         - -files~=^(?!docs/|logo/)
 
-  - name: backport change to main
-    conditions:
-      - base=dev
-      - label=pr/backport
-    actions:
-      backport:
-        branches:
-          - main
-
-  - name: documentation backport
-    conditions:
-      - base=dev
-      - updated-at > 2023-07-13T07:00:00Z
-      - -files~=^(?!docs/|logo/)
-    actions:
-      label:
-        add:
-          - pr/backport
-
-  - name: Inform about code freeze
+  - name: requires manual merge
     conditions:
+      - files=.mergify.yml
+      - -title~=(?i)wip
+      - -label~=(🚧 pr/do-not-merge|⚠️ pr/review-mutation|⚠️ mergify/review-config)
+      - -merged
+      - -closed
+      - "#approved-reviews-by>=1"
+      - "#changes-requested-reviews-by=0"
+      - "#review-threads-unresolved=0"
+      - -approved-reviews-by~=author
+      - check-success=Validate PR title
+      - check-success=Quality Gate
       - base=main
-      - updated-at > 2023-07-13T07:00:00Z
-      - -author=mergify[bot]
     actions:
       comment:
-        message: |
-          :warning: **Code freeze in effect!** :warning:
-
-          The `main` branch is currently frozen. Only critical fixes or documentation updates will be merged.
-          Please submit your pull request against the `dev` branch instead.
+        message: Thank you for contributing! Your pull request contains mergify configuration changes and needs manual merge from a maintainer (be sure to [allow changes to be pushed to your fork](https://help.github.com/en/github/collaborating-with-issues-and-pull-requests/allowing-changes-to-a-pull-request-branch-created-from-a-fork)).
+      label:
+        add:
+          - ⚠️ mergify/review-config
+      request_reviews:
+        teams:
+          - "@winglang/maintainers"