Update the index.rst for ISC25 (#450)

* Update the index.rst for ISC25

* 2024 -> 2025

Author: alecbcs

index.rst

@@ -9,8 +9,9 @@ Tutorial: Spack 101
 ===================
 
 This is an introduction to Spack with lectures and live demos.
-It was last presented at the `Supercomputing 2024 Conference <https://sc24.conference-program.com/presentation/?id=tut182&sess=sess422>`_, November 18, 2024.
-The event was a full-day tutorial.
+It was last presented at the `ISC High Performance 25 Conference <https://isc-hpc.com/>`_
+June 13, 2025.
+The event was a half-day tutorial.
 
 You can use these materials to teach a course on Spack at your own site, or you can just skip ahead and read the live demo scripts to see how Spack is used in practice.
 
@@ -26,9 +27,9 @@ You can use these materials to teach a course on Spack at your own site, or you
 
 :download:`Download Slides <_static/slides/spack-sc24-tutorial-slides.pdf>`.
 
-**Full citation:** Todd Gamblin, Gregory Becker, Alec Scott, Phil Sakievich, and Luke Peyralans.
+**Full citation:** Todd Gamblin, Alec Scott, Massimiliano Culpo, Adam Stewart, Harmen Stoppels, and Michael Kuhn.
 Managing HPC Software Complexity with Spack.
-Supercomputing 2024 (SC24), Atlanta, GA, November 18, 2024.
+ISC High Performance 2025 (ISC25), Hamburg, Germany, June 13, 2025.
 
 .. _video:
 
@@ -48,8 +49,8 @@ You can invoke
 
 .. code-block:: console
 
-   $ docker pull ghcr.io/spack/tutorial:sc24
-   $ docker run -it ghcr.io/spack/tutorial:sc24
+   $ docker pull ghcr.io/spack/tutorial:isc25
+   $ docker run -it ghcr.io/spack/tutorial:isc25
 
 to start using the container. You should now be ready to run through our demo scripts: