[tutorials] Move net tutorials to legacy folder.

tutorials/CMakeLists.txt

@@ -401,7 +401,7 @@ set(extra_veto
   legacy/rootmarks.C          # Instrumentation. Not a standalone tutorial
   multicore/mp_H1_lambdas.C # not a tutorial; used by mp104_processH1.C et al.
   html/*.C
-  net/*.C
+  legacy/net/*.C
   legacy/proof/*.C
   sql/*.C
   tree/hsimpleProxy.C # A driver uses this macro which cannot be executed directly

tutorials/index.md

@@ -130,10 +130,6 @@ The `$ROOTSYS/tutorials` directory includes several sub-directories:
 \ingroup Tutorials
 \brief These examples aim to illustrate the multicore features of ROOT, such as thread awareness and safety, multithreading and multiprocessing.
 
-\defgroup tutorial_net Net tutorials
-\ingroup Tutorials
-\brief Examples showing the net classes.
-
 \defgroup tutorial_pyroot PyRoot tutorials
 \ingroup Tutorials
 \brief Selected examples illustrating how to use ROOT's Python interface: PyROOT.

tutorials/legacy/index.md

@@ -6,3 +6,7 @@ Some of ROOT's tutorials demonstrate interfaces that are not recommended anymore
 ROOT or C++ itself now offer superior ones. These have been moved here "for the record".
 
 @}
+
+\defgroup tutorial_net Net tutorials
+\ingroup tutorial_legacy
+\brief Examples showing the net classes.