liuming / developer-docs

- untracked app/android.md
- removed app/android/.gitkeep
- untracked app/android/ios.md
- removed app/android/parent.md
- removed app/android/student.md
- removed app/android/teacher.md
- removed app/android/tutor.md
- untracked app/iOS.md
- removed app/iOS/.gitkeep
- removed app/iOS/parent.md
- removed app/iOS/student.md
- removed app/iOS/teacher.md
- removed app/iOS/tutor.md
- modified laoluo.md
- modified SUMMARY.md

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