Update .gitignore to ignore all .idea files and all build directories.

.gitignore

@@ -2,30 +2,9 @@
 *.iml
 .gradle
 /local.properties
-/.idea/caches
-/.idea/copilot
-/.idea/libraries
-/.idea/dictionaries
-/.idea/misc.xml
-/.idea/modules.xml
-/.idea/workspace.xml
-/.idea/navEditor.xml
-/.idea/assetWizardSettings.xml
-/.idea/deploymentTargetDropDown.xml
+/.idea
 .DS_Store
-**/build/*.compiler.options
-**/build/.transforms
-**/build/generated
-**/build/intermediates
-**/build/kotlin
-**/build/kotlinToolingMetadata/
-**/build/outputs
-**/build/spotless
-**/build/test-results
-**/build/tmp
-**/build/gmpAppId.txt
-**/build/reports/*
-!**/build/reports/lint-results-debug.txt
+build/
 captures
 .externalNativeBuild
 .cxx