Update Slurm Readme with new and missing vars

[cwrdst]

Add the vars below to the readme, also Group by function Readme vars for easier reading

slurm_local_repo_description
slurm_rpm_local_repo_url
slurm_dasd_d_ver
slurm_dash_d
slurm_enable_systemd_daemon_flag
slurm_propagate_resource_limits
slurm_conf_job_acct_gather_frequency
slurm_conf_accounting_storage_tres
slurm_cgroup_constrain_devices
slurm_cgroup_ignore_systemd
slurm_install_root
slurm_update_symlink
slurm_build_jobs
slurm_enable_cgroup_conf
slurm_restd_jwt_key
slurm_unkillable_step_timeout
slurm_kill_step_script
slurm_prolog_append
slurm_epilog_append
slurm_firewalld_python_interpreter
slurm_groups_allowed
slurm_force_install
slurm_conf_extra