Name it Gyre - Sand Art Table

README, build guide, software README, web page header and title, jog page,
desktop alerts and the start-up message now say Gyre. The repo, the Python
package and its commands keep their names (sandTable, python3 -m sandtable),
so links and setups keep working. New web page screenshot.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

software/tests/test_web.py

@@ -249,7 +249,7 @@ class TestHttp(unittest.TestCase):
             return json.loads(r.read())
 
     def test_pages_and_play(self):
-        self.assertIn(b'Sand Table', self.get('/'))
+        self.assertIn(b'Gyre', self.get('/'))
         self.assertIn(b'jog & calibrate', self.get('/jog'))
         lib = json.loads(self.get('/api/library'))
         self.assertEqual(len(lib), 2)