updates doumentation landing page.

documentation/index.html.in

@@ -17,13 +17,14 @@
     and the
     <a href="https://www.wilczek.physik.uni-bayreuth.de/en/team/index.html">
         University of Bayreuth</a>
-    in collaboration with the Application Support Group of the Max Planck
-    Computing and Data Facility.
+    in collaboration with the Application Support Group of the <a href=https://www.mpcdf.mpg.de/>Max Planck
+        Computing and Data Facility</a>.
     </p>
     <p>
     TurTLE is a framework for
     pseudo-spectral simulations of turbulence, with a highly optimized particle tracking method.
     It consists of a C++ core library, as well as a Python "wrapper" library.
+    TurTLE is open sourced (GPLv3), you may access it <a href="https://gitlab.mpcdf.mpg.de/TurTLE/turtle">here</a>.
     </p>
     <p>
     The documentation consists of two parts: