Merge branch '112-singularity_recipe_hints' into 'preview'

Resolve "docs/software/py_torch.md"

Closes #112

See merge request !827

doc.zih.tu-dresden.de/docs/software/singularity_recipe_hints.md

@@ -32,8 +32,9 @@ From: alpine
   cd ..
   rm -r fmt-5.3.0*
 
-  cat hello.cpp
-#include <fmt/format.h>
+  cat <<'EOF' >>  hello.cpp
+
+#include <fmt/format.h>  // literal
 
 int main(int argc, char** argv){
   if(argc == 1) fmt::print("No arguments passed!\n");