fix broken link in gullies.qmd (#89)

Author: gregorywaynepower

content/tutorials/earthworks/gullies.qmd

@@ -80,7 +80,7 @@ try the landscape evolution model
 This tutorial can be run as a 
 [computational notebook](https://grass-tutorials.osgeo.org/content/tutorials/earthworks/gullies.ipynb).
 Learn how to work with notebooks in the tutorial
-[Get started with GRASS & Python in Jupyter Notebooks](./get_started/fast_track_grass_and_python.qmd).
+[Get started with GRASS & Python in Jupyter Notebooks](./../get_started/fast_track_grass_and_python.qmd).
 :::
 
 # Setup
@@ -355,4 +355,4 @@ m.show()
 
 ![Gullies](images/gullies_03.webp)
 
-![Volumetric change](images/gullies_04.webp)
+![Volumetric change](images/gullies_04.webp)