Merge branch 'feature/doxygen-footer' into 'master'

[doxygen] Extend footer with copyright link

See merge request !3512

(cherry picked from commit c4cb7b89)

0e917dbb [doxygen] Extend footer with copyright link

doc/doxygen/footer.html

@@ -4,7 +4,12 @@
 <div id="nav-path" class="navpath"><!-- id is needed for treeview function! -->
   <ul>
     $navpath
-    <li class="footer">$generatedby <a href="https://www.doxygen.org/index.html"><img class="footer" src="$relpath^doxygen.svg" width="104" height="31" alt="doxygen"/></a> $doxygenversion </li>
+    <li class="footer">
+      &copy; Copyright 2010-<script>document.write(new Date().getFullYear())</script> <a href="https://git.iws.uni-stuttgart.de/dumux-repositories/dumux/-/blob/master/AUTHORS.md">DuMux project contributors</a>
+      (doc pages: <a href="https://creativecommons.org/licenses/by/4.0/">CC-BY 4.0</a> /
+      code examples: <a href="https://www.gnu.org/licenses/gpl-3.0.en.html">GPLv3 or later</a>) &#160;
+      <img class="footer" alt="DuMux" src="$relpath^$projectlogo" height="15"/> $projectnumber
+      &#160; $generatedby <a href="https://www.doxygen.org/index.html"><img class="footer" src="$relpath^doxygen.svg" width="104" height="31" alt="doxygen"/></a> $doxygenversion </li>
   </ul>
 </div>
 <!--END GENERATE_TREEVIEW-->