removing link to old 0.9 documentation

main.py

@@ -331,10 +331,6 @@ def documentation_page() -> None:
     ui.add_head_html('<style>html {scroll-behavior: auto;}</style>')
     with ui.column().classes('w-full p-8 lg:p-16 max-w-[1250px] mx-auto'):
         section_heading('Reference, Demos and more', '*NiceGUI* Documentation')
-        ui.markdown('''
-            This is the documentation for NiceGUI >= 1.0.
-            Documentation for older versions can be found at [https://0.9.nicegui.io/](https://0.9.nicegui.io/reference).
-        ''').classes('bold-links arrow-links')
         documentation.create_full()