Documentation excited state calculation with DirectOpt needs update

We learned that converge_unocc key-word should be deprecated since its results are not reliable. @glevi Please provide an updated tutorial how to carry out excited state calculations (in modes LCAO, PW, FD) using the DirectOpt or any other eigensolver (PPCG?).

https://gpaw.readthedocs.io/documentation/do/do.html

If you do not want to mess with documentation yourself please send me an example workflow which I would convert to a tutorial.