Add GitHub Topics, helps find ASF website examples (#28)

diff --git a/.asf.yaml b/.asf.yaml
index fad461f..9b75975 100644
--- a/.asf.yaml
+++ b/.asf.yaml
@@ -3,4 +3,10 @@
   target: asf-staging
 
 staging:
-  whoami: asf-staging
\ No newline at end of file
+  whoami: asf-staging
+
+github:
+  labels:
+    - lucene
+    - website
+    - pelican