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  The Markdown documentation is withdrawn from the release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>

tests/test_qr_code.py

@@ -64,7 +64,7 @@ class QrCodeTest(unittest.TestCase):
                 self.assertEqual(matrix, expected)
 
     def test_invitation_link(self):
-        link = ("https://kokkoja.andykopra.com/#join=wss://kokkoja.andykopra.com/relay%23"
+        link = ("https://app.kokkoja.com/#join=wss://app.kokkoja.com/relay%23"
                 "AAAAAAAAAAAAAAAAAAAAAA.BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB")
         self.check([(link, "M"), ("", "M"), ("Kokkoja", "M"), ("Mahendra & Artha", "L"),
                     ("Übung 1: äöü", "M")])