Add beginner course for Spring 2026 in Brno (GH-774)

Co-authored-by: Boris Kolda <[email protected]>

Author: boriskolda

courses.yml

@@ -547,3 +547,7 @@ lessons:
   url: https://github.com/mcurlej/naucse-python
   branch: compiled/autumn2025-olomouc
   path: olomouc
+2026/brno-jaro-utery:
+  url: https://github.com/PyLadiesCZ-Brno/naucse-python
+  branch: compiled/main
+  path: 2026-brno-jaro-utery