docs: update chunking usage docs, minor reorg (#550)

Signed-off-by: Panos Vagenas <35837085+vagenas@users.noreply.github.com>

docs/reference/document_converter.md

@@ -0,0 +1,38 @@
+# Document converter
+
+This is an automatic generated API reference of the main components of Docling.
+
+::: docling.document_converter
+    handler: python
+    options:
+        members:
+            - DocumentConverter
+            - ConversionResult
+            - ConversionStatus
+            - FormatOption
+            - InputFormat
+            - PdfFormatOption
+            - ImageFormatOption
+            - StandardPdfPipeline
+            - WordFormatOption
+            - PowerpointFormatOption
+            - MarkdownFormatOption
+            - AsciiDocFormatOption
+            - HTMLFormatOption
+            - SimplePipeline
+        show_if_no_docstring: true
+        show_submodules: true
+        docstring_section_style: list
+        filters: ["!^_"]
+        heading_level: 2
+        inherited_members: true
+        merge_init_into_class: true
+        separate_signature: true
+        show_root_heading: true
+        show_root_full_path: false
+        show_signature_annotations: true
+        show_source: false
+        show_symbol_type_heading: true
+        show_symbol_type_toc: true
+        signature_crossrefs: true
+        summary: true