update target 'make clean'

Makefile

@@ -20,7 +20,9 @@ test-integration: .faux_filter-rivers
 .PHONY: clean
 clean:
 	-./db stop
-	-rm .faux_test .faux_filter-rivers .faux_import-osm .faux.db \
+	-rm -r .faux_test .faux_filter-rivers .faux_import-osm .faux.db \
+		version.tex test-figures.pdf _minted-mj-msc \
+		$(shell git ls-files -o mj-msc*) \
 		$(SLIDES)
 
 .PHONY: clean-tables

mj-msc.tex

@@ -259,8 +259,7 @@ We strongly believe in the ability to reproduce the results is critical for any
 
 \inputminted[fontsize=\small]{bash}{extract-and-generate}
 
-A reasonably up-to-date Linux or OS X system with a working Docker installation
-is required.
+This was tested on Linux Debian 11 with upstream packages only.
 
 \end{appendices}
 \end{document}