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/guest.md

@@ -257,7 +257,7 @@ If you would rather have your pages as files in a directory on your own
 computer, where you can open, copy and back them up as you do any file,
 install the Kokkoja program.  It is small and needs only Python, which
 Linux and macOS have or can quickly get; [A host's Kokkoja](host.md)
-tells how, since every host needs it.  Then join from the program's own
+tells how.  Then join from the program's own
 start screen, pasting the invitation, or follow the start screen's offer
 to open the invitation in the installed program.
 
@@ -300,10 +300,13 @@ right of your toolbar:
   size, centred, 5 mm below the image above or at the top of the page;
   one wider than the page widens it.  To put an image on a page of its
   own, press **New** first.
-* **Notebook** starts a new page for everyone from a page kept in one of
+* **Notebooks** starts a new page for everyone from a page kept in one of
   your notebooks, with everything that was written on it.  A chooser
   shows your notebooks and small pictures of their kept pages.  The kept
-  page itself is not changed: the session works on a copy.
+  page itself is not changed: the session works on a copy.  The same
+  chooser deletes pages and notebooks of yours, marked with their ×
+  and then the **Delete** button, pressed twice; the host's part says
+  more.
 * **Hide**, among the tools, hides part of the page for everyone: drag
   open a rectangle and whatever lies under it, writing included, is
   covered in white, marked by blue corners so that nobody writes there