[PIP-87][website] Remove .asf.yaml as website content is moving to repos/pulsar-site (#15537)

diff --git a/.asf.yaml b/.asf.yaml
deleted file mode 100644
index 8dd9499..0000000
--- a/.asf.yaml
+++ /dev/null
@@ -1,3 +0,0 @@
-publish:
-  whoami: asf-site
-  source: github