Big documentation rewrite, move docs to example site

exampleSite/content.en/book/index.md

@@ -5,3 +5,34 @@ menu:
   after:
     weight: 7
 ---
+
+# Single Page Layout
+
+This page uses `layout: book`, which renders all content on a single page without sidebar navigation.
+
+Use this layout for standalone pages that don't belong in the documentation hierarchy, such as:
+
+- Changelog or release notes
+- A comprehensive reference that should be scrollable as one document
+- Print-friendly pages
+
+## Configuration
+
+Set in frontmatter:
+
+```yaml
+---
+layout: book
+---
+```
+
+The page can still appear in menus via the `menu` frontmatter parameter:
+
+```yaml
+---
+layout: book
+menu:
+  after:
+    weight: 7
+---
+```