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

src/i18n/homepage/index.ts

@@ -0,0 +1,33 @@
+import { de } from './de';
+import { en } from './en';
+import { es } from './es';
+import { fr } from './fr';
+import { ja } from './ja';
+import { ru } from './ru';
+import type { HomepageContent, LocaleKey } from './types';
+
+const homepageByLocale: Record<LocaleKey, HomepageContent> = {
+  en,
+  de,
+  fr,
+  es,
+  ru,
+  ja,
+};
+
+export type { HomepageContent, LocaleKey } from './types';
+
+export function getHomepageContent(locale: string): HomepageContent {
+  const normalizedLocale = (locale || 'en').toLowerCase();
+  const languageOnly = normalizedLocale.split('-')[0] as LocaleKey;
+
+  if (normalizedLocale in homepageByLocale) {
+    return homepageByLocale[normalizedLocale as LocaleKey];
+  }
+
+  if (languageOnly in homepageByLocale) {
+    return homepageByLocale[languageOnly];
+  }
+
+  return homepageByLocale.en;
+}