Documentation and spice scripts update.

[bolb-ocean]

For a summary:

• Updated and rearranged spice scripts to match updated workflow
• Updated readme to match new workflow
• Minor adjustments to merg_mean_surface_crps.py and plot_surface_crps.py to add consistency with use of /profiles.
• Added use of config.comp_case into plot_surface_crps.py and added comp variables to spice_config