Make formatting consistent and remove references to the LiPD class

[khider]

This is mostly a cosmetic PR (e.g., assumes that all code is working) but will allow to start with a good template for all notebooks to actually fix code. Note that I don't expect the test to pass on this (shouldn't because of the run time of the correlation notebook).

What was actually done:

• All templates were reformatted to go with "by" followed by author names with a link to ORCID. This fixes Pretty faces for notebook authors #35. The templates also include the preamble/data/Demosntration headers
• Added watermark to all notebooks. Might be useful for users trying to reproduce our workflows.
• Remove LiPD focused notebook (while moving all appropriate functionalities that were associated with the LiPD class to other notebooks) and make sure that we are no longer using the LiPD class anywhere. Fixes pyLipd integration into tutorials #23

[review-notebook-app]

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[CommonClimate]

The LiPD class is still used in the correlation NB, without importing pylipd, so this cell fails for me:

D = LiPD()

D.load('../data/Ocn-Palmyra.Nurhati.2011.lpd')

timeseries,df = D.get_timeseries(D.get_all_dataset_names(),to_dataframe=True)

df

Is from pylipd.lipd import LiPD the only import that needs to be changed? I don't have xarray installed and I'm afraid to try as I fear it will break NumPy, Pandas and maybe others...

[khider]

Works on my machine with pandas 2.1.4. I tried to pin the version but it gets upgraded.

[CommonClimate]

Merging and hoping for the best