Portal updates for the R2 release

[robyngit]

This issue is to track updates that we need to make to the portal doc along with the next MetacatUI release (R2 aka 2.30).

• [x] Ice-Wedge Polygons colorPalette - Change to a continuous palette ranging from transparent to full opacity yellow. Currently it's a single colour, but the property visualized is "Percent area covered by polygons". Consider shortening property name to "Percent Area".
• [x] Drained Lake Basins, North Slope, 2014-2019 colorPalette.property - Remove
• [x] Surface Water Index trend 2000-2022 colorPalette.property - Change to "July Trend in Avg"
• [ ] Permafrost Zones colorPalette.property - Remove
• [x] Infrastructure colorPalette.property - Is DN a standard term?

[ianguerin]

• [x] Enable showShareUrl flag in PDG map configuration

[ianguerin]

• [x] Ensure all layers have a layerId attribute, as this is necessary for storing it as an enabled layers in the URL

[robyngit]

• [x] LEO colorPalette should be just 1 colour now