chore: add dirs

Author: MC-XiaoHei

docs/en/annotations/index.md

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+---
+title: Annotation-based Commands
+order: 5
+---

docs/en/contribution/index.md

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+---
+title: CommandAPI Contribution
+order: 11
+---

docs/en/internal/index.md

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+---
+title: Internal CommandAPI
+order: 9
+---

docs/en/kotlin-dsl/index.md

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+---
+title: Kotlin-based Commands
+order: 6
+---

docs/en/tips/index.md

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+---
+title: Java Tips
+order: 10
+---

docs/en/utilities/index.md

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+---
+title: CommandAPI Utilities
+order: 8
+---

docs/en/velocity/index.md

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+---
+title: Velocity
+order: 7
+---