chore: Remove unnecessary files

Author: lijy91

.gitignore

@@ -8,6 +8,7 @@
 .buildlog/
 .history
 .svn/
+migrate_working_dir/
 
 # IntelliJ related
 *.iml
@@ -18,12 +19,11 @@
 # The .vscode folder contains launch configuration and tasks you configure in
 # VS Code which you may wish to be included in version control, so this line
 # is commented out by default.
-.vscode/
+#.vscode/
 
 # Flutter/Dart/Pub related
 # Libraries should not include pubspec.lock, per https://dart.dev/guides/libraries/private-files#pubspeclock.
 /pubspec.lock
 **/doc/api/
 .dart_tool/
-.packages
 build/