links to source files added

docs.it4i/software/viz/insitu.md

@@ -17,14 +17,10 @@ The Catalyst library is part of the ParaView module. More about ParaView can be
 
 All code concerning the simulator/adaptor is available to download from [here][code]. It is a package with the following files: [CMakeLists.txt][cmakelist_txt], [FEAdaptor.h][feadaptor_h], [FEAdaptor.cxx][feadaptor_cxx], [FEDataStructures.h][fedatastructures_h], [FEDataStructures.cxx][fedatastructures_cxx], [FEDriver.cxx][fedriver_cxx] and [feslicescript.py][feslicescript].
 
-
-
-```{r engine='bash', comment=''}
-cat insitu/CMakeLists.txt
+```{r comment=''}
+cat(readLines('insitu/CMakeLists.txt'), sep = '\n')
 ```
 
-
-
 After the download unpack the code by
 
 ```console