updated makefile for submodule update

hakyll-bootstrap/Makefile

 watch: build
 	stack exec blog -- watch
 
-deploy: build
+deploy: build update
 	stack exec blog -- deploy
 
 build: Main.hs cours/math_tech_info/*.md cours/isc_physics/*.md
@@ -14,6 +14,10 @@ build: Main.hs cours/math_tech_info/*.md cours/isc_physics/*.md
 
 build_revealjs:
 	cd reveal.js && npm install && npm run build && cd ..
+		
+
+update:
+	git submodule update --recursive --remote
 
 clean:
 	rm -rf _cache _site