adjust readme binder link and add banner for scipy

Author: scottyhq

README.md

@@ -2,7 +2,7 @@
 
 [![Deploy Website to GitHub Pages](https://github.com/xarray-contrib/xarray-tutorial/actions/workflows/main.yaml/badge.svg)](https://github.com/xarray-contrib/xarray-tutorial/actions/workflows/main.yaml)
 [![Jupyter Book Badge](https://jupyterbook.org/badge.svg)](https://tutorial.xarray.dev)
-[![Binder](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/xarray-contrib/xarray-tutorial/HEAD?labpath=overview/xarray-in-45-min.ipynb)
+[![Binder](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/xarray-contrib/xarray-tutorial/HEAD?labpath=workshops/scipy2025/index.ipynb)
 
 This is the repository for a Jupyter Book website with tutorial material for [Xarray](https://github.com/pydata/xarray), _an open source project and Python package that makes working with labelled multi-dimensional arrays simple, efficient, and fun!_
 

_config.yml

@@ -10,7 +10,7 @@ exclude_patterns: [.github, .pixi]
 html:
   # NOTE: this announcement shows up on all pages
   #announcement: '<a href="https://forms.gle/KEq7WviCdz9xTaJX6">The Xarray 2024 User Survey is live. Please take ~5 minutes to fill it out and help us improve Xarray.</a>'
-  #announcement: 'ℹ️ SciPy 2024 Tutorial Attendees. <a href="https://tutorial.xarray.dev/workshops/scipy2024/README.html">Click here </a>.'
+  announcement: 'ℹ️ SciPy 2025 Tutorial Attendees. <a href="https://tutorial.xarray.dev/workshops/scipy2025/index.html">Click here! </a>.'
   home_page_in_navbar: false
   use_edit_page_button: true
   use_issues_button: true