revert: Remove HTML repr of Items

Closes #1161

skore/src/skore/persistence/item/item.py

@@ -5,11 +5,7 @@
 import inspect
 from abc import ABC, abstractmethod
 from datetime import datetime, timezone
-from pathlib import Path
 from typing import Any, Optional
-from uuid import uuid4
-
-from jinja2 import Environment, FileSystemLoader
 
 
 class ItemTypeError(Exception):
@@ -89,33 +85,6 @@ def __repr__(self) -> str:
         """Represent the item."""
         return f"{self.__class__.__name__}(...)"
 
-    def _repr_mimebundle_(self, include=None, exclude=None):
-        return {"text/html": self._repr_html_()}
-
-    def _repr_html_(self):
-        """Represent the item in a notebook."""
-        item_folder = Path(__file__).resolve().parent
-        templates_env = Environment(loader=FileSystemLoader(item_folder))
-        template = templates_env.get_template("standalone_widget.html.jinja")
-
-        static_files_path = item_folder.parent / "ui" / "static" / "assets"
-
-        def read_asset_content(path):
-            with open(static_files_path / path) as f:
-                return f.read()
-
-        script_content = read_asset_content("index.js")
-        styles_content = read_asset_content("index.css")
-
-        context = {
-            "id": uuid4().hex,
-            "item": self.as_serializable_dict(),
-            "script": script_content,
-            "styles": styles_content,
-        }
-
-        return template.render(**context)
-
     def as_serializable_dict(self):
         """Convert item to a JSON-serializable dict to used by frontend.