Nomad changes

docs/snippets/elixir/advanced/chunk_page_mapping.md

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+```elixir title="Elixir"
+config_json = Jason.encode!(%{
+  "chunking" => %{
+    "enabled" => true,
+    "max_characters" => 1024,
+    "overlap" => 128
+  }
+})
+
+{:ok, result} = Kreuzberg.extract_file_sync("document.pdf", "application/pdf", config_json)
+
+# Map chunks to their source pages
+chunks_with_pages = result.chunks
+  |> Enum.map(fn chunk ->
+    %{
+      "chunk_id" => chunk["id"],
+      "content" => chunk["content"],
+      "page_number" => chunk["page"]
+    }
+  end)
+
+IO.inspect(chunks_with_pages, label: "Chunks with Page Mapping")
+```