[Doc] Model order reduction on a hexaBeam under the gravity

[rmolazem]

A demonstration of applying model order reduction to a hexaBeam under the gravity force.

[VannesteFelix]

Thanks @rmolazem !
I guess you intend to do the same things with the hexabeam as for the liver.
So it would be great to have a general folder called simply hexabeam and put the different reduction results in it.

[rmolazem]

Actually, for the hexaBeam, I only wanted to put the example of the gravity. Another hexaBeam scene with the cable constraint requires some modifications.

[VannesteFelix]

Ok @rmolazem, then can you just change the folder name by just hexaBeam please ?

[rmolazem]

Sure!