Merge Docusaurus site: all content under docs/, align with gregFramework split layout

- Move markdown and wiki-import tree into docs/; keep app shell at repo root
- Point docusaurus docs path to docs/; edit links to mleem97/gregWiki
- Sync and i18n scripts use gregWiki root and ../.wiki under gregFramework
- Sidebars: workspace layout from root docs ids; plugins under mods/extensions
- Fix redirects, module catalog URLs, release note paths, and wiki-import category keys
- Update repo inventory for split repos; Dockerfile for single-repo context

Made-with: Cursor

docs/topics/mod-developers/overview.md

@@ -0,0 +1,14 @@
+---
+title: Mod developers
+sidebar_label: Mod developers (hub)
+description: Getting started, mod config, debugging — links into wiki-import ModDevs tree.
+---
+
+# Mod developers
+
+**Mod-Autorinnen und -Autoren** — eigene Mods bauen (Hooks, Konfiguration, Debug). Überblick über alle Rollen: [By audience](/wiki/topics/audiences/overview).
+
+- [By audience — intermediates / professionals](/wiki/audiences/intermediates) and [professionals](/wiki/audiences/professionals)
+- Wiki: [Framework overview](/wiki/mods/framework)
+- Imported: [ModDevs](/wiki/wiki-import/ModDevs/), [Modding guide](/wiki/wiki-import/Modding-Guide), [Mod config system](/wiki/wiki-import/Mod-Config-System)
+- Imported: [Standalone mods](/wiki/wiki-import/StandaloneMods)