NEW COVID Economic story from Ship Detections

[aapopescu]

Merge all ship detection stories into a single one.

• https://race.esa.int/?search=Dunkirk%3A+Ships+in+Port&x=255276.94136&y=6625685.81806&z=13.60832&poi=FR3-E200

• https://race.esa.int/?search=Algeciras%3A+Vessel+density&x=-558688.30629&y=4291184.72552&z=10.76573&poi=ES1-E1b

• https://race.esa.int/?search=World%3A+Vessel+density+%28all%29+%5Bh%2Fsqkm%5D&x=-558688.30629&y=4291184.72552&z=10.76573&poi=World-E13o

• https://github.com/eurodatacube/eodash/blob/staging/app/public/eodash-data/stories/E200.md

• https://github.com/eurodatacube/eodash/blob/staging/app/public/eodash-data/stories/E13o.md

• https://github.com/eurodatacube/eodash/blob/staging/app/public/eodash-data/stories/E13e.md