Update README with GSoC 2026 note and donation info (#315)

Added note about non-participation in GSoC 2026

Author: Mariatta

readme.md

@@ -2,6 +2,8 @@
 
 PyLadiesCon online conference management tool.
 
+Note that we are **not** participating in GSoC 2026.
+
 :moneybag: Support the development of this project by [donating to PyLadiesCon](https://2025.conference.pyladies.com/en/donate/).
 
 ## About PyLadiesCon
@@ -56,4 +58,4 @@ and participants in the Python open source community.
 
 ## Local Dev setup
 
-Go to [the Dev setup documentation page](https://pyladiescon-portal-docs.netlify.app/developer/setup/).
+Go to [the Dev setup documentation page](https://pyladiescon-portal-docs.netlify.app/developer/setup/).