fix broken link in levees.qmd

[gregorywaynepower]

No description provided.

[baharmon]

@gregorywaynepower @petrasovaa These links doesn't seem to be working yet. For the levee tutorial, this links currently goes to https://grass-tutorials.osgeo.org/content/tutorials/earthworks/get_started/fast_track_grass_and_python.qmd
and results in 404 Not Found, when it should go to https://grass-tutorials.osgeo.org/content/tutorials/get_started/fast_track_grass_and_python.html.

[gregorywaynepower]

Thanks @baharmon, I've got a new PR to address the issue from these last few PRs: #91

[baharmon]

@gregorywaynepower I also have a PR with edits to the earthworks tutorials so they might need merging.