Adds a symlink to update and make it curlable installable

update.sh

@@ -260,4 +260,13 @@ function update_repos() {
 	run_git submodule update
 }
 
-update_home
+if [ ! -d "$HOME/.home" ]
+then
+	echo "--- cloning git.tuleu.science:atuleu/home.git in $HOME/.home"
+	pushd $HOME 1>/dev/null
+	run_git clone https://git.tuleu.science/atuleu/home.git .home
+	.home/update.sh "$@"
+	popd 1>/dev/null
+else
+	update_home
+fi