refactor: update project branding and structure for gregFramework

- Changed project title and tagline in docusaurus.config.js to reflect the new branding.
- Updated package.json and package-lock.json to rename the project to gregwiki-docs-site.
- Adjusted sidebar and documentation files to align with the new project structure and naming conventions.
- Enhanced documentation content for clarity and consistency across various sections.
- Added Prettier as a development dependency for code formatting.

This commit aligns the project with the new branding and improves overall documentation quality.

docs/reference/modding-language-requirement.md

@@ -0,0 +1,30 @@
+---
+id: modding-language-requirement
+title: Modding language (C# only)
+slug: /reference/modding-language-requirement
+description: Mandatory language for mods, MelonLoader plugins, and extensions — C# only.
+---
+
+# Modding language (C# only)
+
+## Requirement
+
+**All logic for mods, MelonLoader plugins, and framework extensions must be implemented in C#.**
+
+That applies to anything shipped as a **`gregMod.*`**, **`gregExt.*`**, or **`FFM.Plugin.*`** / **`FMF.*`** module that loads through the MelonLoader / IL2CPP stack: gameplay code, Harmony patches, UI, networking hooks, and data handling belong in **C#** (typically targeting **.NET** compatible with your MelonLoader build).
+
+## Rationale
+
+- **MelonLoader** loads managed **.NET** assemblies; Harmony and the interop layer are built around C#.
+- A single language keeps reviews, debugging, and CI consistent for contributors.
+
+## What this does *not* restrict
+
+- **Framework core** (`gregCore`) may still contain **non-C#** components maintained by core maintainers (for example the **Rust** FFI bridge under `bridges/gregSta.RustBridge/`, build scripts, or tooling). Those are **not** substitutes for implementing mod/plugin/extension behavior outside C#.
+- **Documentation**, **config** (JSON/YAML), and **assets** are not “logic” in this sense.
+- **gregStore**, **gregWiki**, and other non–in-game stacks may use other languages as appropriate.
+
+## See also
+
+- [Framework](/wiki/mods/framework) — runtime surface for mod authors
+- [FMF hook naming](/wiki/reference/fmf-hook-naming)