Populate description for S5P-L3GRD-ALH-DAY

[dmoglioni]

@AparicioSF Description to be filled here for S5P-L3GRD-ALH-DAY. Additional information available also on the Copernicus S-5P Mapping Portal.

[AparicioSF]

• Description to the S5P-L3GRD-AAI-DAY markdown - completed.

• Edition to S5P-L3GRD-AAI-DAY JSON - completed.
  I added provider, tags, theme, and the suggested title change.

• Add link to STAC browser