Purge .idea folder and update .gitignore

.gitignore

@@ -1,57 +1,37 @@
-## Directory-based project format:
-
-# Generated by gradle
-*.iml
-
-# All log files e.g. by audit
-*.log
-
-# User-specific stuff:
-.idea/workspace.xml
-.idea/tasks.xml
-.idea/dictionaries
-.idea/sonarIssues.xml
-.idea/misc.xml
-.idea/dbnavigator.xml
-
-# Sensitive or high-churn files:
-.idea/dataSources*
-.idea/dataSources.ids
-.idea/sqlDataSources.xml
-.idea/dynamic.xml
-.idea/uiDesigner.xml
-.idea/inspectionProfiles/
-
-# Gradle:
-.idea/gradle.xml
-.idea/libraries
-
-## File-based project format:
-*.ipr
-*.iws
-
-## Plugin-specific files:
-
-# Package Files #
-*.jar
-
-# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
-hs_err_pid*
-
-### Gradle template
+HELP.md
 .gradle
 build/
+!gradle/wrapper/gradle-wrapper.jar
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
 out/
-
-# Ignore Gradle GUI config
-gradle-app.setting
-
-# Avoid ignoring Gradle wrapper jar file (.jar files are usually ignored)
-!gradle-wrapper.jar
-
-# Included binaries
-!src/main/native/*
-
-# temporary server files
-tmp
-static/
+!**/src/main/**/out/
+!**/src/test/**/out/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/