Update Tree image.

src/data-structures/tree/README.md

@@ -27,7 +27,9 @@ 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

@@ -16,7 +16,9 @@
 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