Revert "Update .gitignore"

This reverts commit cee2747a97.

app/.gitignore

@@ -1,8 +1,15 @@
-# Created by https://www.gitignore.io/api/java,gradle
+/build
+
+# Created by https://www.gitignore.io/api/java
+# Edit at https://www.gitignore.io/?templates=java
 
 ### Java ###
+# Compiled class file
 *.class
 
+# Log file
+*.log
+
 # BlueJ files
 *.ctxt
 
@@ -12,26 +19,15 @@
 # Package Files #
 *.jar
 *.war
+*.nar
 *.ear
+*.zip
+*.tar.gz
+*.rar
+*.gradle
 
 # virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
 hs_err_pid*
 
+# End of https://www.gitignore.io/api/java
 
-### Gradle ###
-.gradle
-/build/
-
-# Ignore Gradle GUI config
-gradle-app.setting
-
-# Avoid ignoring Gradle wrapper jar file (.jar files are usually ignored)
-!gradle-wrapper.jar
-
-# Cache of project
-.gradletasknamecache
-
-# # Work around https://youtrack.jetbrains.com/issue/IDEA-116898
-# gradle/wrapper/gradle-wrapper.properties
-
-# End of https://www.gitignore.io/api/java,gradle