Update mangrove layer style

adding line-width to make it visible at low zoom levels
Grump: change tiles origin
Grump: new color ramp
Grump: position layer properly
Grump: correct tiles origin
Merge pull request #1028 from Vizzuality/feature/layer-grump

Feature/layer grump
Mobile about: awards & testimonials triangle
Merge branch 'develop' of github.com:Vizzuality/gfw into feature/mobile