cleaner README, focused on 5.0

Author: andrus

README.md

@@ -31,17 +31,16 @@ Cayenne supports numerous other features, including caching, an object query syn
 
 ## Quick Links
 
-* [Getting Started](https://cayenne.apache.org/docs/5.0/getting-started-guide/)
 * [Getting Started DB-First](https://cayenne.apache.org/docs/5.0/getting-started-db-first/)
+* [Getting Started](https://cayenne.apache.org/docs/5.0/getting-started-guide/)
 * [Documentation](https://cayenne.apache.org/docs/5.0/cayenne-guide/)
-* [Upgrading from Older Cayenne](UPGRADE.md)
+* [Upgrading from Older Cayenne](https://github.com/apache/cayenne/blob/master/UPGRADE.md)
 
 ## Quick Start
 
 ### Create XML Mapping
 
 Downloaded Cayenne Modeler from https://cayenne.apache.org/download/, start it and create a Cayenne project.
-See tutorial https://cayenne.apache.org/docs/4.2/getting-started-guide/ 
 
 ### Include Cayenne in a Project