docs: refine documentation structure and language consistency

- Updated the tagline in `docusaurus.config.js` for improved clarity.
- Streamlined sidebar navigation items for better organization of player and developer resources.
- Enhanced README and various documentation files to clarify repository layout and improve accessibility.
- Standardized language to English across documentation, ensuring consistency and clarity.
- Removed unnecessary German localization references to focus on English content.

This commit aims to enhance the overall clarity and usability of the documentation.

docs/workspace/index.mdx

@@ -13,7 +13,7 @@ The **gregFramework** folder groups several repositories (split layout). Use thi
 | **Framework core** | `gregCore/` | MelonLoader host (`gregCore/framework/FrikaMF.csproj`), templates, **`gregCore/mcp-server/`**, optional `gregCore/plugins/` mirrors |
 | **Gameplay mods** | `gregMod.<Name>/` | Standalone mods (`FMF.*`) — **directly under `gregFramework/`** (the `gregMods/` umbrella is deprecated) |
 | **Framework plugins** | `gregExt.<Name>/` | FFM plugins (`FFM.Plugin.*`) — **directly under `gregFramework/`** (the `gregExtensions/` umbrella is deprecated) |
-| **ModManager (MAUI)** | `gregModmanager/` | **Gregtools Modmanager** — grafisches Frontend zur Verwaltung von Mods/Plugins; `WorkshopUploader.csproj`, **`WorkshopUploader.exe`**. Siehe [Architecture principles](/wiki/meta/system-architecture-principles). |
+| **ModManager (MAUI)** | `gregModmanager/` | **Gregtools Modmanager** — UI for managing mods/plugins; `WorkshopUploader.csproj`, **`WorkshopUploader.exe`**. See [Architecture principles](/wiki/meta/system-architecture-principles). |
 | **Data Center exporter / assets** | `gregDataCenterExporter/` | Templates, exporter tooling, `FrikaModFramework/fmf_hooks.json` (among copies) |
 | **Documentation** | `gregWiki/` | This Docusaurus site (`docs/`) |
 | **Mod store / web (if cloned)** | `gregStore/` | Private Next.js modstore stack (`web/`, …) — optional sibling repo |