A host from the web site; the same page kept once; deleting from the Notebooks chooser

From the development repository at 299f73d, 2026-10-11:
hosting from the site documented; a page loaded from a notebook and left
unchanged is not kept again; notebooks and pages are deleted from the
chooser, to the system's Trash (--trash); the Notebooks button.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

README.md

@@ -27,9 +27,11 @@ may be used.
 ## In short
 
 A guest needs nothing but a web browser: open the invitation link, enter
-a name, join.
+a name, join.  A host can start a session from the same web site,
+`https://kokkoja.andykopra.com/`, with the notebooks kept in the
+browser.
 
-A host needs Python 3 and this directory:
+A host who wants notebooks as files needs Python 3 and this directory:
 
     python3 kokkoja.py --relay wss://kokkoja.andykopra.com/relay