(doc) disable merge commit

diff --git a/.asf.yaml b/.asf.yaml
index 9ab8e03..7c05736 100644
--- a/.asf.yaml
+++ b/.asf.yaml
@@ -24,3 +24,7 @@
     - maven-plugins
     - maven-jlink-plugin
     - maven
+  enabled_merge_buttons:
+    squash: true
+    merge: false
+    rebase: true