Merge pull request #3431 from jupyterhub/jupytercon-banner

Add a JupyterCon sign-up link to the mybinder banner

Author: rgaiacs

mybinder/values.yaml

@@ -186,10 +186,10 @@ binderhub:
             🤍 Donate to mybinder.org!
         </a>
         <div style="text-align:center;">
-        Thanks to <a href="https://www.gesis.org">GESIS</a> and <a href="https://2i2c.org">2i2c</a> for supporting us! 🎉
+        Join us in San Diego · JupyterCon 2025 · Nov 4-5 · <a href="https://events.linuxfoundation.org/jupytercon/program/schedule/?ajs_aid=53afb00d-be65-4a99-9112-28cdaac99463">SCHEDULE</a> · <a href="https://events.linuxfoundation.org/jupytercon/register/?ajs_aid=53afb00d-be65-4a99-9112-28cdaac99463">REGISTER NOW</a>
         </div>
         <div style="text-align:center;">
-        mybinder.org has updated the base image to Ubuntu 22.04! See the <a href="https://repo2docker.readthedocs.io/en/latest/howto/breaking_changes.html">upgrade guide</a> for details.
+        Thanks to <a href="https://www.gesis.org">GESIS</a> and <a href="https://2i2c.org">2i2c</a> for supporting mybinder.org! 🎉
         </div>
       about_message: |
         <p>mybinder.org is public infrastructure operated by the <a href="https://jupyterhub-team-compass.readthedocs.io/en/latest/team.html#binder-team">Binder Project team</a>.<br /><br />