fix: improve doc link navigation and tree display

- Fix link resolution with proper relative/absolute path handling
- Improve link styling with underline decoration
- Hide leaf nodes from tree, only show directories
- Fix log file path for packaged app

docs/api/rhi/opengl/vertex-array/get-index-count.md

@@ -0,0 +1,20 @@
+# OpenGLVertexArray::GetIndexCount
+
+```cpp
+unsigned int GetIndexCount() const
+```
+
+获取索引数量。
+
+**返回：** `unsigned int` - 索引数量
+
+**示例：**
+
+```cpp
+unsigned int count = vao.GetIndexCount();
+glDrawElements(GL_TRIANGLES, count, GL_UNSIGNED_INT, 0);
+```
+
+## 相关文档
+
+- [OpenGLVertexArray](vertex-array.md) - 返回类总览