Make title cleaner

mkdocs.yml

@@ -1,7 +1,7 @@
 pages:
   - 主页: 'index.md'
   - 简介: 'intro.md'
-  - 入门(Getting started):
+  - 入门:
     - OpenGL: '01 Getting started/01 OpenGL.md'
     - 创建窗口: '01 Getting started/02 Creating a window.md'
     - 你好，窗口: '01 Getting started/03 Hello Window.md'
@@ -20,11 +20,11 @@ pages:
     - 投光物: '02 Lighting/05 Light casters.md'
     - 多光源: '02 Lighting/06 Multiple lights.md'
     - 复习: '02 Lighting/07 Review.md'
-  - 加载模型(Model Loading):
+  - 加载模型:
     - Assimp: '03 Model Loading/01 Assimp.md'
     - 网格: '03 Model Loading/02 Mesh.md'
     - 模型: '03 Model Loading/03 Model.md'
-  - 高级OpenGL(Advanced OpenGL):
+  - 高级OpenGL:
     - 深度测试: '04 Advanced OpenGL/01 Depth testing.md'
     - 模板测试: '04 Advanced OpenGL/02 Stencil testing.md'
     - 混合: '04 Advanced OpenGL/03 Blending.md'
@@ -36,7 +36,7 @@ pages:
     - 几何着色器: '04 Advanced OpenGL/09 Geometry Shader.md'
     - 实例化: '04 Advanced OpenGL/10 Instancing.md'
     - 抗锯齿: '04 Advanced OpenGL/11 Anti Aliasing.md'
-  - 高级光照(Advanced Lighting):
+  - 高级光照:
     - 高级光照: '05 Advanced Lighting/01 Advanced Lighting.md'
     - Gamma校正: '05 Advanced Lighting/02 Gamma Correction.md'
     - 阴影:
@@ -49,7 +49,7 @@ pages:
     - 泛光: '05 Advanced Lighting/07 Bloom.md'
     - 延迟着色法: '05 Advanced Lighting/08 Deferred Shading.md'
     - SSAO: '05 Advanced Lighting/09 SSAO.md'
-  - 实战(In Practice):
+  - 实战:
     - 文字渲染: '06 In Practice/02 Text Rendering.md'
     - 2D游戏:
       - Breakout: '06 In Practice/2D-Game/01 Breakout.md'