MNT: Fix doc makefiles

- match make.bat with Makefile
- clean sg_execution_times.rst and git ignore it
  (see sphinx gallery matplotlib#1198)

Author: StefRe

.gitignore

@@ -83,6 +83,7 @@ result_images
 doc/_static/constrained_layout*.png
 doc/.mpl_skip_subdirs.yaml
 doc/_tags
+sg_execution_times.rst
 
 # Nose/Pytest generated files #
 ###############################

doc/Makefile

@@ -26,6 +26,7 @@ clean:
 	rm -rf "$(SOURCEDIR)/savefig"
 	rm -rf "$(SOURCEDIR)/sphinxext/__pycache__"
 	rm -f $(SOURCEDIR)/_static/constrained_layout*.png
+	rm -f $(SOURCEDIR)/sg_execution_times.rst
 
 show:
 	@python -c "import webbrowser; webbrowser.open_new_tab('file://$(shell pwd)/build/html/index.html')"

doc/make.bat

@@ -40,8 +40,11 @@ if "%1" == "clean" (
 	rmdir /s /q "%SOURCEDIR%\gallery"
 	rmdir /s /q "%SOURCEDIR%\plot_types"
 	rmdir /s /q "%SOURCEDIR%\tutorials"
+	rmdir /s /q "%SOURCEDIR%\users\explain"
 	rmdir /s /q "%SOURCEDIR%\savefig"
 	rmdir /s /q "%SOURCEDIR%\sphinxext\__pycache__"
+	del /q "%SOURCEDIR%\_static\constrained_layout*.png"
+	del /q "%SOURCEDIR%\sg_execution_times.rst"
 )
 goto end