Benutze course-details für kursabhängige Daten

Signed-off-by: Daniel Borchmann <daniel@algebra20.de>

exercises/course-details.tex

@@ -0,0 +1 @@
+../lectures/course-details.tex

exercises/latexkurs-uebung.cls

@@ -50,9 +50,13 @@
 
 %%%
 
+\input course-details
+
+%%%
+
 \renewcommand{\maketitle}{
   \begin{tikzpicture}[overlay]
-    \node at (12.2,0.3) [black!50,text width=5.5cm,align=right] {\url{http://algebra20.de/dtl1516}};
+    \node at (12.2,0.3) [black!50,text width=5.5cm,align=right] {\courseURL};
     \node at (4,0.4) {\scalebox{2}{\textcolor{black!20}{\Huge Einführung}}};
     \node at (12, -2.5) {\scalebox{2}{\textcolor{black!20}{\Huge in
           \LaTeX}}};