Content: Sea level projects

[hanbyul-here]

Adding content

Add sea level discovery. Part of NASA-IMPACT/veda-ui#467
Opening this pr to share the status. Do not merge.

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Content checklist

Check the Content Documentation for more details.

Any content

• Cover image with proper attribution (when relevant) is present.
• Cover images do not contain any text (they're used as a background and text may not be readable).
• All images are not too big/heavy. As a general rule of thumb, they should not weigh more than 500KB, or be larger than 2000px. See the media guide for more info.
• Content was added using the available MDX Blocks.

Datasets

• Layer description is defined.
• Layer legend is setup.
• The Dataset is showing up on the map correctly

Discoveries

• Publication date value is set

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