Merge pull request #1005 from pytorch/brianjo-patch-1

Update Makefile - Speeds Netlify preview build.

Author: brianjo

Makefile

@@ -108,8 +108,9 @@ docs:
 	touch docs/.nojekyll
 
 html-noplot:
+	make clean
 	$(SPHINXBUILD) -D plot_gallery=0 -b html $(SPHINXOPTS) "$(SOURCEDIR)" "$(BUILDDIR)/html"
-	bash .jenkins/remove_invisible_code_block_batch.sh "$(BUILDDIR)/html"
+	# bash .jenkins/remove_invisible_code_block_batch.sh "$(BUILDDIR)/html"
 	@echo
 	@echo "Build finished. The HTML pages are in $(BUILDDIR)/html."