ci should use master head from theme

.gitlab-ci.yml

-variables:
-  GIT_SUBMODULE_STRATEGY: recursive
+before_script:
+  - git submodule sync --recursive
+  - git submodule update --init --recursive --remote
 
 compile_pdf:
   image: tianon/latex
   script:
-    - make all
+    - make demo
   artifacts:
     paths:
       - demo.pdf

README.md

@@ -10,6 +10,12 @@ Make sure to checkout the submodule as well, for example by using
 
 	git clone --recursive https://gitlab.cs.fau.de/i4/tex/i4neo-demo.git
 
+or -- for having the latest theme features -- by using
+
+	git clone https://gitlab.cs.fau.de/i4/tex/i4neo-demo.git
+	cd i4neo-demo
+	git submodule update --init --recursive --remote
+
 To build the demo, make sure you have a TeX distribution (like *TeX Live*)
 installed and simply run