[Android] Cleanup and remove legacy stuff

Android.gitignore

-# Built application files
-*.apk
-*.ap_
-*.aab
-
-# Files for the ART/Dalvik VM
-*.dex
-
-# Java class files
-*.class
-
-# Generated files
-bin/
-gen/
-out/
-#  Uncomment the following line in case you need and you don't have the release build type files in your app
-# release/
-
 # Gradle files
 .gradle/
 build/
@@ -23,58 +5,27 @@ build/
 # Local configuration file (sdk path, etc)
 local.properties
 
-# Proguard folder generated by Eclipse
-proguard/
-
-# Log Files
+# Log/OS Files
 *.log
+.DS_Store
 
-# Android Studio Navigation editor temp files
-.navigation/
-
-# Android Studio captures folder
+# Android Studio generated files and folders
 captures/
+.externalNativeBuild/
+.cxx/
+*.apk
+output.json
 
 # IntelliJ
 *.iml
-.idea/workspace.xml
-.idea/tasks.xml
-.idea/gradle.xml
-.idea/assetWizardSettings.xml
-.idea/dictionaries
-.idea/libraries
-.idea/jarRepositories.xml
-# Android Studio 3 in .gitignore file.
-.idea/caches
-.idea/modules.xml
-# Comment next line if keeping position of elements in Navigation Editor is relevant for you
-.idea/navEditor.xml
+.idea/
 
 # Keystore files
 *.jks
 *.keystore
 
-# External native build folder generated in Android Studio 2.2 and later
-.externalNativeBuild
-.cxx/
-
 # Google Services (e.g. APIs or Firebase)
-# google-services.json
-
-# Freeline
-freeline.py
-freeline/
-freeline_project_description.json
-
-# fastlane
-fastlane/report.xml
-fastlane/Preview.html
-fastlane/screenshots
-fastlane/test_output
-fastlane/readme.md
-
-# Version control
-vcs.xml
+google-services.json
 
 # Android Profiling
 *.hprof