Use liquid for layouting of tutorials

* Adjust to relative paths
* Restructure titles
* Adapt Java DB tutorial to unified layout
* Adapt Java EE project tutorial to unified layout
* Adapt JBoss setup tutorial to unified layout
* Adapt JMS/.NET tutorial to unified layout
* Adapt .NET setup tutorial to unified layout
* Adapt Java Webservice tutorial to unified layout
* Adapt .NET Webservice tutorial to unified layout