update gitignore and remove untracked files

.gitignore

@@ -1,33 +1,35 @@
-HELP.md
+### Java & Maven ###
 target/
-.mvn/wrapper/maven-wrapper.jar
-!**/src/main/**/target/
-!**/src/test/**/target/
+*.class
+*.war
+*.ear
+*.jar
+*.lst
 
-### STS ###
+### Logs ###
+logs/
+*.log
+
+### IntelliJ IDEA ###
+.idea/
+*.iml
+*.iws
+*.ipr
+out/
+
+### STS / Eclipse ###
 .apt_generated
 .classpath
 .factorypath
 .project
-.settings
+.settings/
 .springBeans
 .sts4-cache
 
-### IntelliJ IDEA ###
-.idea
-*.iws
-*.iml
-*.ipr
-
-### NetBeans ###
-/nbproject/private/
-/nbbuild/
-/dist/
-/nbdist/
-/.nb-gradle/
-build/
-!**/src/main/**/build/
-!**/src/test/**/build/
-
 ### VS Code ###
 .vscode/
+
+### OS files ###
+.DS_Store
+Thumbs.db
+desktop.ini