Port Docs-Viewer to slatehtml as the docs-viewer package.

Replace the classic DOM shell with slate widgets, markdown→slate rendering, and a CI index build that uses build-docs.cjs.

index.json

@@ -0,0 +1,37 @@
+{
+  "defaultPage": "home",
+  "customCSS": "custom/theme.css",
+  "metadata": {
+    "title": "Project Documentation",
+    "description": "Comprehensive documentation for various projects.",
+    "thumbnail": "img/default-thumbnail.png",
+    "site_name": "DocsHub"
+  },
+  "author": {
+    "name": "John Doe",
+    "role": "Software Engineer",
+    "socials": [
+      {
+        "icon": "fab fa-github",
+        "url": "https://github.com/johndoe",
+        "title": "GitHub - JohnDoe"
+      },
+      {
+        "icon": "fab fa-youtube",
+        "url": "https://youtube.com/c/JohnDoe",
+        "title": "YouTube - JohnDoe"
+      },
+      {
+        "icon": "fab fa-discord",
+        "url": "https://discordapp.com/users/1234567890",
+        "title": "Discord - @JohnDoe"
+      },
+      {
+        "icon": "fa-brands fa-bluesky",
+        "url": "https://bsky.app/profile/john.doe.dev",
+        "title": "Bluesky - john.doe.dev"
+      }
+    ]
+  },
+  "documents": []
+}