site_url and remove obsolete docs.yaml

Author: SiyaoIsHiding

docs.yaml

@@ -1,6 +1,6 @@
 site_name: Java Driver for Apache Cassandra
 site_description: Java Driver for Apache Cassandra® Documentation
-site_url: https://github.com/apache/cassandra-java-driver
+site_url: https://apache.github.io/cassandra-java-driver
 repo_url: https://github.com/apache/cassandra-java-driver
 repo_name: apache/cassandra-java-driver