Update Tree image.

Author: trekhleb

src/data-structures/tree/README.md

@@ -10,24 +10,26 @@ _Read this in other languages:_
 * [Segment Tree](segment-tree) - with min/max/sum range queries examples
 * [Fenwick Tree](fenwick-tree) (Binary Indexed Tree)
 
-In computer science, a **tree** is a widely used abstract data 
-type (ADT) — or data structure implementing this ADT—that 
-simulates a hierarchical tree structure, with a root value 
-and subtrees of children with a parent node, represented as 
+In computer science, a **tree** is a widely used abstract data
+type (ADT) — or data structure implementing this ADT—that
+simulates a hierarchical tree structure, with a root value
+and subtrees of children with a parent node, represented as
 a set of linked nodes.
 
-A tree data structure can be defined recursively (locally) 
-as a collection of nodes (starting at a root node), where 
-each node is a data structure consisting of a value, 
-together with a list of references to nodes (the "children"), 
-with the constraints that no reference is duplicated, and none 
+A tree data structure can be defined recursively (locally)
+as a collection of nodes (starting at a root node), where
+each node is a data structure consisting of a value,
+together with a list of references to nodes (the "children"),
+with the constraints that no reference is duplicated, and none
 points to the root.
 
 A simple unordered tree; in this diagram, the node labeled 7 has
 two children, labeled 2 and 6, and one parent, labeled 2. The
 root node, at the top, has no parent.
 
-![Tree](https://upload.wikimedia.org/wikipedia/commons/f/f7/Binary_tree.svg)
+![Tree](./images/tree.jpeg)
+
+*Made with [okso.app](https://okso.app)*
 
 ## References
 

src/data-structures/tree/README.pt-BR.md

@@ -22,7 +22,9 @@ Uma árvore não ordenada simples; neste diagrama, o nó rotulado como `7`
 possui dois filhos, rotulados como `2` e `6`, e um pai, rotulado como `2`.
 O nó raíz, no topo, não possui nenhum pai.
 
-![Tree](https://upload.wikimedia.org/wikipedia/commons/f/f7/Binary_tree.svg)
+![Tree](./images/tree.jpeg)
+
+*Made with [okso.app](https://okso.app)*
 
 ## Referências
 

src/data-structures/tree/README.zh-CN.md

@@ -13,10 +13,12 @@
 
 一棵简单的无序树; 在下图中:
 
-标记为7的节点具有两个子节点, 标记为2和6; 
+标记为7的节点具有两个子节点, 标记为2和6;
 一个父节点,标记为2,作为根节点, 在顶部,没有父节点。
 
-![Tree](https://upload.wikimedia.org/wikipedia/commons/f/f7/Binary_tree.svg)
+![Tree](./images/tree.jpeg)
+
+*Made with [okso.app](https://okso.app)*
 
 ## 参考