LOG4J2-760 Doc improvement: link to Maven-generated dependency tree from log4j-core component page to make it easier for users to find the exact JARs they need. Also link to log4j-core component page from FAQ page.

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1617306 13f79535-47bb-0310-9956-ffa450edef68
LOG4J2-773: site: log4j-core component pages were still using the old logo.

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1617308 13f79535-47bb-0310-9956-ffa450edef68