MAINT: add -f flag for _panels in publish (#268)

* MAINT: Maintenance and Updates

* update python build versions

* update deprecated syntax in _config.yml

* additional config for updated theme

* fix toml files in download nb repo

* add -f flag to removals

Author: mmcky

.github/workflows/publish.yml

@@ -93,8 +93,8 @@ jobs:
           mkdir -p _build/lecture-julia.notebooks
           cp -a _notebook_repo/. _build/lecture-julia.notebooks
           cp -a _build/jupyter/. _build/lecture-julia.notebooks
-          rm -r _build/lecture-julia.notebooks/_static
-          rm -r _build/lecture-julia.notebooks/_panels_static
+          rm -rf _build/lecture-julia.notebooks/_static
+          rm -rf _build/lecture-julia.notebooks/_panels_static
           cp lectures/Project.toml _build/lecture-julia.notebooks
           cp lectures/Manifest.toml _build/lecture-julia.notebooks
           ls -a _build/lecture-julia.notebooks