Character codes in typed text; the site and relay at app.kokkoja.com

With the Text tool, Klammertext's codes give letters a keyboard lacks:
^o" is ö, ^s^ ß, ^a1 ā, ^130ED^ a code point of 4 to 6 digits,
^9053 53EF^ a sequence, ^^ a caret, replaced as each code is completed.
The public site and relay moved to app.kokkoja.com; the old name
redirects.  The Markdown documentation is withdrawn from the release
while it is converted to Klammertext; the README's links to it are
stale until then.

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

deploy/setup_vps.sh

@@ -12,7 +12,7 @@
 #
 # TLS is the one step left to a person, once the name resolves to this
 # machine (see deploy/README.md):
-#   certbot --nginx -d kokkoja.andykopra.com
+#   certbot --nginx -d app.kokkoja.com -d kokkoja.andykopra.com
 
 set -euo pipefail
 incoming=/opt/kokkoja/incoming