Update _Sidebar

_Sidebar.md

@@ -9,10 +9,33 @@
 ## 🛠️ Development
 - [Build Instructions](Buildmd)
 
-## 🔍 Engine Details
+## 🔍 Manual
-- [UI System](ui.md)
+### Core
+- [Game entry point](Game-entry-point.md)
+- [Systems](Systems.md)
+- [Resource management](Resources.md)
+- [Working with text resources](Working-with-text-resources.md)
+
+### I/O
+- [Loading files](Loading-files.md)
+### Input
+- [Getting input](Getting-input.md)
+- [Input actions](Input-actions.md)
+### Rendering
+- [Rendering system overview](Render-System.md)
+- [Custom shaders](Custom-Shaders.md)
 - [Rendering Pipeline](Rendering.md)
-- [Resource Management](Resources.md)
+### UI
+- [UI system overview](UI.md)
+- [Widgets](Widgets.md)
+- [Containers](Containers.md)
+- [Styling](Styling.md)
+- [Layout](Layout.md)
+- [Custom widgets and containers](Custom-widgets-and-containers.md)
+- [Debugging UI](Debugging-UI.md)
+### Debugging
+- [Profiler methods](Profiler-methods.md)
+- [Viewing profiler reports](Viewing-profiler-reports.md)
 
 ## 📖 Reference
 - [Glossary](Glossary.md)