HBASE-18852 Take down the hbasecon asia banner on home page
HBASE-18852 Take down the hbasecon asia banner on home page

Signed-off-by: Chia-Ping Tsai <51ef25fd0a3611d18ffb478ae2ae610bbbd2432c@gmail.com>

HubSpot/hbase,HubSpot/hbase,HubSpot/hbase,HubSpot/hbase,HubSpot/hbase,HubSpot/hbase,HubSpot/hbase,HubSpot/hbase,HubSpot/hbase,HubSpot/hbase