remove render graphs from Makefile

Author: jakobhellermann

Makefile

@@ -1,7 +1,7 @@
 .PHONY: docs
 docs:
 	cargo run --example generate_docs
-	ls docs/schedule/{light,dark}/*.dot docs/render/{light,dark}/*.dot | xargs -I '{}' dot -Tsvg '{}' -o '{}.svg'
+	ls docs/schedule/{light,dark}/*.dot | xargs -I '{}' dot -Tsvg '{}' -o '{}.svg'
 
 	./docs/generate_readme.sh