Add link to packaging slides

Author: ZedThree

course.md

@@ -123,6 +123,8 @@ Packaging your software is one of the important steps in a software project to m
 
 Python users will want to register for an account on [TestPyPi](https://test.pypi.org/) and install [uv](https://docs.astral.sh/uv/getting-started/installation/).
 
+**Course materials:** [slides][packaging_slides]
+
 ### Publishing a software paper in JOSS
 **Wednesday 15th April 2026, 1pm to 2pm, hybrid.**
 
@@ -203,4 +205,6 @@ We'd love to hear your (anonymous) feedback: please fill in our [feedback form][
 [docs_lesson]: https://researchcodingclub.github.io/documentation/
 
 [joss_slides]: https://researchcodingclub.github.io/slides/2026-04-15-publishing-in-joss.pdf
-[joss_video]: https://york-ac-uk.zoom.us/rec/share/KQsK3YR4RGTitZrsuGJMXhCIqzd1GeGcjsmMtXOFtEO7nkEcRXBFVEcX7WkDjeia.Bzf74IFgSmsw_W2I
+[joss_video]: https://york-ac-uk.zoom.us/rec/share/KQsK3YR4RGTitZrsuGJMXhCIqzd1GeGcjsmMtXOFtEO7nkEcRXBFVEcX7WkDjeia.Bzf74IFgSmsw_W2I
+
+[packaging_slides]: /slides/2026-05-06-packaging.pdf