try another fix for html standalone

Makefile

@@ -10,7 +10,7 @@ PDFOPTIONS += --number-sections
 
 HTMLOPTIONS += -t html5
 HTMLOPTIONS += -c css/tufte-css/tufte.css
-HTMLOPTIONS += --standalone
+HTMLOPTIONS += --standalone --embed-resources
 HTMLOPTIONS += --mathjax=MathJax.js
 
 CLASS_SOURCES := $(sort $(filter-out README.md, $(wildcard *.md)))
@@ -39,7 +39,7 @@ cours.pdf: $(CLASS_SOURCES)
 	pandoc -s $(OPTIONS) $(PDFOPTIONS) -o $@ $^ --metadata-file metadata.yaml
 
 cours.html: $(CLASS_SOURCES)
-	pandoc -s $(OPTIONS) $(HTMLOPTIONS) -o $@ $^ --metadata-file metadata.yaml
+	pandoc $(OPTIONS) $(HTMLOPTIONS) -o $@ $^ --metadata-file metadata.yaml
 
 $(PDF): %.pdf: 00_macros.md %.md 10_footer.md
 	pandoc -s $(OPTIONS) $(PDFOPTIONS) -o $@ $^ --metadata-file metadata.yaml
@@ -66,7 +66,6 @@ deploy: all
 	mkdir -p phys/field_lines
 	cp cours.html phys/index.html
 	cp cours.pdf phys/cours.pdf
-	rsync -avzz css phys/
 	make -C exercices
 	make -C practical_work
 	mkdir -p phys/exercices