Suggestion to change name of the "MIT ash" scheme to the "SEVIRI ash" scheme

Concerns the "MIT ash" RGB product, referenced in the function:

Line 675 in d5cb93c

    
           def to_ash(da: xr.DataArray, convention: str = "MIT") -> npt.NDArray[np.float32]:

.

The recipe for the particular ash RGB used in the Kulik (2019) thesis is based on the SEVIRI ash recipe, I believe. The linked resource also has some nice examples of interpretation of the ash RGB.

Perhaps it makes sense to replace the citation to the MIT Thesis with this one, or at least add it?

Will do, thank you for sharing the reference!

Stubbed in #169

@VincentMeijer just pulled this into the main, thanks for the suggestion!