Fix PVSEC notebook filename

Author: kandersolar

source/index.rst

@@ -29,7 +29,7 @@ event etc, you can contact us at pvlib-admin@googlegroups.com.
 
         +++
 
-        :bdg-link-primary:`Website <https://colab.research.google.com/github/PV-Tutorials/2026_pvlib_eupvsec/blob/main/pvlib-introduction-part-1.ipynb>` 
+        :bdg-link-primary:`Website <https://colab.research.google.com/github/PV-Tutorials/2026_pvlib_eupvsec/blob/main/pvlib_2026_eupvsec_introduction_part_1.ipynb>` 
         :bdg-link-primary:`Repository <https://github.com/PV-Tutorials/2026_pvlib_eupvsec>`
 
         .. raw:: html