fix: Enable HTML export in CLI and add options for image mode (#513)

* updated README

Signed-off-by: Peter Staar <taa@zurich.ibm.com>

* removed duck in title

Signed-off-by: Peter Staar <taa@zurich.ibm.com>

* updated the index.md

Signed-off-by: Peter Staar <taa@zurich.ibm.com>

* updated the cli to export html

Signed-off-by: Peter Staar <taa@zurich.ibm.com>

* added html to cli

Signed-off-by: Peter Staar <taa@zurich.ibm.com>

* reformatted the code

Signed-off-by: Peter Staar <taa@zurich.ibm.com>

* removed the duck emoji, added the  in the cli. Currently, the referenced seems broken

Signed-off-by: Peter Staar <taa@zurich.ibm.com>

* cleaning up the comments

Signed-off-by: Peter Staar <taa@zurich.ibm.com>

* reference is now working

Signed-off-by: Peter Staar <taa@zurich.ibm.com>

* Clean up styling and docs

Signed-off-by: Christoph Auer <cau@zurich.ibm.com>

* Pin docling-core>=2.7.1

Signed-off-by: Christoph Auer <cau@zurich.ibm.com>

---------

Signed-off-by: Peter Staar <taa@zurich.ibm.com>
Signed-off-by: Christoph Auer <cau@zurich.ibm.com>
Co-authored-by: Christoph Auer <cau@zurich.ibm.com>

docling/datamodel/base_models.py

@@ -41,6 +41,7 @@ class InputFormat(str, Enum):
 class OutputFormat(str, Enum):
     MARKDOWN = "md"
     JSON = "json"
+    HTML = "html"
     TEXT = "text"
     DOCTAGS = "doctags"