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/meta/overview.md

@@ -0,0 +1,14 @@
+---
+title: Meta & operations
+sidebar_label: Meta & operations
+description: Workshop tooling, devserver betas, idea backlog — repo-level notes.
+---
+
+# Meta & operations
+
+These pages are **not** end-user game docs; they describe how we ship and plan around the project.
+
+- [Game folder layout (FMF / MelonLoader)](/wiki/topics/meta/game-folder-layout) — `UserData/ModCfg`, `FMF/Plugins`, `Mods`.
+- [Steam Workshop and tooling](/wiki/meta/Steam-Workshop-and-Tooling) — uploader, references workflow.
+- [Devserver betas](/wiki/meta/devserver-betas) — beta channel notes.
+- [IDEA backlog](/wiki/meta/IDEA_BACKLOG) — unstructured idea list (also used by automation).