groge/confluence repository overview

Change only Open JDK to Oracle Java from Official Confluence Image 6.6.7

Attlassian said, "Due to terms in the Oracle license agreement, we're not able to provide you with an image that uses Oracle JDK, so you would have to build an image yourself following Update the Confluence Docker image to use Oracle JDK guide" https://confluence.atlassian.com/confkb/update-the-confluence-docker-image-to-use-oracle-jdk-829062521.html?_ga=2.85302617.1538789148.1532150986-1884648705.1506621499⁠