Add missing logo

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HBASE-8238 xref docs missing from site gen

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.95@1463320 13f79535-47bb-0310-9956-ffa450edef68
HBASE-7904 Revert, due to concern over coprocessor exposure



git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.95@1463325 13f79535-47bb-0310-9956-ffa450edef68