I want to re-make only edited notebooks.

Not all of them each time.

docs/Makefile

@@ -0,0 +1,27 @@
+#docs      := $(wildcard *.ipynb)
+#docs_html := $(patsubst %.ipynb,%.html,$(docs))
+
+.PHONY: poop nospaces yesspaces
+
+# https://stackoverflow.com/a/45531875
+# Make cannot handle spaces in filenames, so temporarily rename them
+nospaces:
+	rename -v 's/ /%20/g' *\ *
+
+# After Make is done, rename files back to having spaces
+yesspaces:
+	rename -v 's/%20/ /g' *%20*
+
+
+poop: *.ipynb
+	make "$(patsubst %.ipynb,%.html,$<)"
+
+%.html : %.ipynb
+	python -m nbconvert --to html $<
+
+%.md : %.ipynb
+	python -m nbconvert --to markdown $<
+
+%.rst : %.ipynb
+	python -m nbconvert --to rst $<
+