Remove link to outdated slides

tobyhodges · web-flow · commit 17e9e6591546 · 2022-12-15T12:56:07.000+01:00
diff --git a/_extras/guide.md b/_extras/guide.md
@@ -2,10 +2,6 @@
 title: "Instructor Notes"
 ---
 
-## Image Basics
-
-* [Presentation slides](../files/01-image-basics/01-image-basics.pdf)
-
 ## Working with skimage
 
 * Be aware, that learners might get surprising results in the *Keeping only low intensity pixels* exercise, if `plt.imshow` is called without the `vmax` parameter.
