remove subtree from makefile

Makefile

@@ -27,9 +27,5 @@ ref: svg-ref
 creds:
 	cd images && pandoc artists.md -o ../art.pdf
 all: ref ${filename}.pdf resources.pdf creds
-tree:
-	[ -e ../config ] || ( echo "You don't have a local config repo" && exit 1 )
-	git status
-	git subtree -P config pull ../config ${branch} -m'pull config'
 clean:
 	rm -fr *.aux *.toc *.acn *.log *.ptc *.out *.idx *.ist *.glo *.glg *.gls *.acr *.alg *.ilg *.ind *.pdf .ref svg-inkscape