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/getting-started/documentation-layout.md

@@ -2,7 +2,7 @@
 id: documentation-layout
 title: Documentation layout (`docs/`)
 sidebar_label: Documentation layout
-description: How curated docs, guides, and the legacy GitHub Wiki mirror are organized under docs/.
+description: How curated docs, guides, and reference material are organized under docs/.
 ---
 
 # Documentation layout (`docs/`)
@@ -26,34 +26,17 @@ This folder is the **single source of truth** for the public Docusaurus site. Th
 | **Contributors** | [`contributors/`](../contributors/repo-inventory.md) | Repo inventory, Docusaurus workflow, design system. |
 | **Roadmap** | [`roadmap/`](../roadmap/unified-roadmap.md) | Planning docs. |
 | **Topics hub** | [`topics/`](../topics/index.md) | Cross-cutting overviews (assets, multiplayer, security, …). |
-| **Meta** | [`meta/`](../meta/Steam-Workshop-and-Tooling.md) | Workshop tooling notes, devserver API, backlog. |
-| **Legacy** | [`legacy/`](../legacy/index.md) | GitHub Wiki mirror under `legacy/wiki-import/`. |
-
-## Legacy GitHub Wiki (`docs/legacy/wiki-import/`)
-
-Long-form pages mirrored from the **GitHub Wiki** live here (synced from `.wiki/`).
-
-1. Clone the wiki working tree as **`../.wiki/`** under `gregFramework/` (same level as sibling repos).
-2. From **gregWiki** root: `npm run wiki:refresh` (or `wiki:sync` → `wiki:normalize-i18n`).
-3. German paired pages live under `i18n/de/docusaurus-plugin-content-docs/current/legacy/wiki-import/` after normalization.
-4. Prefer **new curated docs** under `guides/`, `reference/`, or `framework/`; keep bulk legacy material in `legacy/wiki-import/` until migrated.
-
-Details: [`topics/wiki-import/overview`](../topics/wiki-import/overview.md).
+| **Meta** | [`meta/`](../meta/Steam-Workshop-and-Tooling.md) | Workshop tooling notes, devserver API, backlog; **[architecture principles](../meta/system-architecture-principles.md)** (stack model & doc rules). |
 
 ## URLs
 
 - Doc id `intro` → `/wiki/docs`.
 - Typical doc → `/wiki/<doc-id-path>` (e.g. `mods/framework` → `/wiki/mods/framework`).
 
-## Scripts (gregWiki root)
-
-| Script | Role |
-|--------|------|
-| `wiki:sync` | Copies `.wiki/` → `docs/legacy/wiki-import/`. |
-| `wiki:normalize-i18n` | Splits DE/EN pairs into default locale + `i18n/de/...`. |
-| `write-wiki-import-category-keys` | Refreshes `_category_.json` keys under imported trees. |
-
 ## Locales
 
-- **Default:** `en` — files under `docs/`.
-- **Deutsch (`de`):** overrides under `i18n/de/docusaurus-plugin-content-docs/current/` mirroring `docs/` paths where translated files exist; otherwise Docusaurus falls back to English.
+- **Language:** English only — all curated content lives under `docs/`.
+
+## Historical note
+
+The former GitHub Wiki bulk import under `docs/legacy/wiki-import/` has been **removed**. Author new material under the folders above; use Git history if you need obsolete text.