docs: update docusaurus configuration and documentation structure

- Revised the tagline in `docusaurus.config.js` for improved clarity on the documentation's focus.
- Removed German localization support from the configuration to streamline the user experience.
- Updated navigation items in the sidebar to better reflect the current structure, emphasizing player and developer resources.
- Enhanced the README and various documentation files to clarify the repository layout and improve accessibility for users.
- Adjusted links and descriptions throughout the documentation to ensure consistency and accuracy.

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

docs/README.md

@@ -0,0 +1,36 @@
+# Documentation layout (`docs/`)
+
+This folder is the **single source of truth** for the public Docusaurus site. The app lives in the **gregWiki** repository root next to `docs/`; built pages are served under the **`/wiki`** base path.
+
+## How content is organized
+
+| Area | Path | Purpose |
+|------|------|--------|
+| **Landing** | [`intro` → `/wiki/docs`](/wiki/docs) | Site home (`/wiki/docs`). |
+| **Topics hub** | [`topics/`](./topics/index.md) | Cross-cutting overviews (security, FFI, multiplayer, assets, meta). |
+| **Mods & plugins** | [`mods/`](./mods/), [`plugins/`](./plugins/) | Gameplay mods (`FMF.*`) and framework plugins (`FFM.Plugin.*`). |
+| **Releases** | [`releases/`](./releases/) | Per-artifact release notes. |
+| **Reference** | [`reference/`](./reference/) | Hooks, naming, MCP, generated catalogs. |
+| **Contributors** | [`contributors/`](./contributors/) | Repo layout, Docusaurus workflow, design system. |
+| **Guides** | [`guides/`](./guides/players/overview.md) | Role-based paths (players, mod developers, contributors, sponsors). |
+| **Roadmap** | [`roadmap/`](./roadmap/) | Planning docs. |
+| **Meta** | [`meta/`](./meta/) | Workshop, devserver, backlog; [architecture principles](./meta/system-architecture-principles.md) (ModManager → Framework → Plugins → Mods). |
+
+## URLs
+
+- Doc id `intro` → `/wiki/docs` (see front matter).
+- Most docs → `/wiki/<doc-path>` (e.g. `mods/framework` → `/wiki/mods/framework`).
+
+## Scripts (repository root)
+
+| Script | Role |
+|--------|------|
+| `wiki:sync` | **No-op** (legacy GitHub Wiki mirror removed). |
+| `wiki:normalize-i18n` | **No-op** (same). |
+| `wiki:refresh` | Runs both no-ops; safe for old CI hooks. |
+
+Author new pages under `docs/`; use **git history** if you need text from the former bulk import.
+
+## Locales
+
+- **Language:** English only — files under `docs/`.