add meta description.
Revert "remove cname from master"

This reverts commit 4f46f81f506cd6da351e5d6a059afee1ea247e54.
add meta description
Revert "Revert "remove cname from master""

This reverts commit 7eb67a2c50efcde0be36a5c8645be358b66d5c1e.