Update design document (yorkie-team#630)

Wu22e · Sep 3, 2023 · 98054ad · 98054ad
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 ## Contents
 
-- [Document Editing](document-editing.md): Local and remote document editing mechanism
-- [Presence](presence.md): For sharing the presence of peers
 - [Data Structure](data-structure.md): CRDT data structures in `crdt` package
+- [Document Editing](document-editing.md): Local and remote document editing mechanism
+- [Document Removal](document-removal.md): Soft deletion of document
+- [Tree](tree.md): Tree CRDT data structure
 - [Range Deletion in Splay Tree](range-deletion-in-splay-tree.md): Rotation-free range deletion algorithm for splay tree
+- [Presence](presence.md): For sharing the presence of peers
 - [PubSub](pub-sub.md): Client-side event sharing with gRPC server-side stream and PubSub pattern
 - [Garbage Collection](garbage-collection.md): Deleting unused nodes in CRDT system
 - [Garbage Collection for Text Type](gc-for-text-type.md): Garbage collection for text nodes
 - [Housekeeping](housekeeping.md): Deactivating outdated clients for efficient garbage collection
 - [Retention](retention.md): Clearing unnecessary changes with `--backend-snapshot-with-purging-changes` flag
-- [Document Removal](document-removal.md): Soft deletion of document
 - [Sharded Cluster Mode](sharded-cluster-mode.md): Shard-based server cluster mode with consistent hashing
 
 ## Maintaining the Document