Switch EnTT to Flecs

Author: ljm12914

docs/attributions.mdx

@@ -5,7 +5,7 @@
 - [bgfx](https://github.com/bkaradzic/bgfx): A cross-platform rendering library that provides a (rather) "simple" API for rendering graphics.
 - [Boost](https://www.boost.org): A collection of C++ libraries that provide a wide range of high-performance functionality, including `unordered_flat_map` when everyone has had enough with `std::unordered_map`.
 - [CLI11](https://github.com/CLIUtils/CLI11): A command-line parser for C++ that provides a simple and intuitive way to parse command-line arguments.
-- [EnTT](https://github.com/skypjack/entt): A fast and reliable entity-component-system (ECS) library for C++ that provides a flexible way to manage game objects and their behaviors. Also it's sponsored by Mojang :)
+- [Flecs](https://github.com/SanderMertens/flecs): An entity-component-system (ECS) library that provides a solid support for both compile-time and runtime components.
 - [FreeType](https://www.freetype.org): A font engine that provides a high-quality rendering of text in various formats.
 - [glaze](https://github.com/stephenberry/glaze): A fast, user-friendly C++ JSON library that provides a simple and efficient way to parse and generate JSON data.
 - [glm](https://github.com/g-truc/glm): A header-only C++ mathematics library for graphics software based on the OpenGL Shading Language (GLSL) specifications.

docs/cg/design.mdx

@@ -17,7 +17,7 @@ So there is mainly three parts of the design: The core, the interface for conten
 ```mermaid
 graph LR
     A[Simulation]-->B[Unified Modding Interface]
-    A-->C(entt)
+    A-->C(Flecs)
     B-->D(V8)
     B-->E(Wasmtime)
     B-->F(Luau)