added link to StudyATHome Hub

presentations/project-overview/project-overview.tex

@@ -147,7 +147,7 @@
             \includegraphics[width=0.7\textwidth]{elearning_course_sharing.pdf}%
             \caption{Sharing courses via StudyATHome Hub}
         \end{figure}\vspace{1em}
-        Download \href{https://es.technikum-wien.at/StudyATHome_public/StudyATHome_public/raw/master/internationalization/eLearning-sharing-concept.pdf?inline=false}{eLearning Sharing Concept} document.
+        \centering \href{https://hub.studyathome.technikum-wien.at/}{eLearning Sharing Hub} website.
     \end{frame}
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