Add section about server subcommand in documentation
Add section about server subcommand in documentation

pythia-project/pythia-core,pythia-project/pythia,pythia-project/pythia-core,pythia-project/pythia-core,pythia-project/pythia,pythia-project/pythia,pythia-project/pythia,pythia-project/pythia-core,pythia-project/pythia-core,pythia-project/pythia-core,pythia-project/pythia,pythia-project/pythia