added Makefile for submodules

.gitmodules

@@ -1,4 +1,4 @@
-[submodule "homepage/redesign2018/markdownExperiment/zopfli"]
+[submodule "submodules/zopfli"]
 	path = submodules/zopfli
 	url = https://github.com/google/zopfli.git
 [submodule "submodules/parsedown"]
@@ -7,9 +7,6 @@
 [submodule "submodules/spyc"]
 	path = submodules/spyc
 	url = https://github.com/mustangostang/spyc.git
-[submodule "homepage/materialize"]
-	path = homepage/materialize
-	url = https://github.com/materializecss/materialize.git
 [submodule "submodules/lite-youtube-embed"]
 	path = submodules/lite-youtube-embed
 	url = https://github.com/paulirish/lite-youtube-embed.git

submodules/Makefile

@@ -0,0 +1,10 @@
+.PHONY: updateSubmodules
+updateSubmodules:
+	git -C lite-youtube-embed checkout master
+	git -C materialize checkout main
+	git -C parsedown checkout master
+	git -C spyc checkout master
+	git -C zopfli checkout master
+
+	git submodule foreach git pull
+