Add information on grid dimensions or dataset-specific tutorials

[RondeauG]

Currently, all datasets refer to the same tutorial. This works in most cases, but breaks for datasets such as ESPO-G6-R2 or ClimEx, since their dimensions (time, rlat, rlon) differ from those in the tutorial (time, lat, lon). As it has occurred recently, this might result in people trying to chunk those datasets along lon/lat, which will do nothing and bust available RAM.

• Solution 1: Explicitly write the dataset dimensions in the Summary tab and have a place in the tutorial where this is referenced.
• Solution 2: Have multiple versions of the same tutorial, 1 per grid type (regular, rotated, stations, etc.).

Also, for rotated grids, a section on regridding in the tutorial would be really useful.