Create list/gallery of datasets available in fetch

[mdtanker]

Description of the desired feature:

Automatically extract function from fetch to create either a list of datasets, or a gallery of thumbnails of the datasets.

To do:

• add notebooks for each below dataset
• add notebooks to docs/datasets/index.md
• add note in fetch walkthrough

Datasets to add to gallery:

• basement
• bedmachine
• bedmap2
• bedmap_points
• crustal_thickness
• deepbedmap
• etopo
• geoid
• geomap
• ghf
• gia
• gravity
• groundingline
• ibcso
• ibcso_coverage
• ice_vel
• imagery
• magnetics
• mass_change
• measures_boundaries
• modis_moa
• modis_mog
• moho
• rema
• rosetta_gravity
• rosetta_magnetics
• sediment_thickness

Are you willing to help implement and maintain this feature?

Yes

[JessicaS11]

My wish-list for this feature would include making some basic metadata accessible as well. For example, dataset version and source/citation.