providing additional avatar demo

website/more_documentation/avatar_documentation.py

@@ -1,6 +1,17 @@
 from nicegui import ui
 
+from ..documentation_tools import text_demo
+
 
 def main_demo() -> None:
     ui.avatar('favorite_border', text_color='grey-11', square=True)
     ui.avatar('img:https://nicegui.io/logo_square.png', color='blue-2')
+
+
+def more() -> None:
+    @text_demo('Photos', '''
+        To use a photo as an avatar, you can use `ui.image` within `ui.avatar`.
+    ''')
+    async def photos() -> None:
+        with ui.avatar():
+            ui.image('https://robohash.org/robot?bgset=bg2')