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>

docs/quickstart.md

@@ -10,9 +10,10 @@ works](implementation.md).
 Kokkoja has three parts.  The **client** is plain JavaScript that runs
 in a browser.  The **local program**, `kokkoja.py`, serves the client to
 your own browser and keeps your notebooks as directories of SVG files;
-a host needs it, a guest does not.  The **relay** passes the
-participants' messages, encrypted end to end so that it cannot read
-them, and serves the client to guests as a web site; Andy's relay at
+without it the notebooks live in the browser's storage.  The **relay**
+passes the participants' messages, encrypted end to end so that it
+cannot read them, and serves the client as a web site, from which anyone
+can host or join with nothing installed; Andy's relay at
 `kokkoja.andykopra.com` is there for you, and you can run your own.
 
 ## Requirements
@@ -36,6 +37,10 @@ the directory.
 
 ## Host a session
 
+With nothing installed: open `https://kokkoja.andykopra.com/`, enter a
+name, press **Start a session**; the notebooks are then in the browser.
+With the program, for notebooks as files:
+
     python3 kokkoja.py --relay wss://kokkoja.andykopra.com/relay
 
 The program prints `http://localhost:8760/#token=…` and opens your
@@ -64,7 +69,7 @@ rather than in the browser's storage.
 
 The toolbar holds the pen, text, eraser and hide tools, colours and
 line widths, the view commands (Fit, A4, Widen, Shrink, Extend), the
-host's page buttons (New, Image, Notebook), your notebook, Keep, Export
+host's page buttons (New, Image, Notebooks), your notebook, Keep, Export
 and Session.  Rest the pointer on any button for two seconds for its
 explanation.  Each participant writes on a layer of their own that
 nobody else can change.  The page is saved continuously to the current