use Norgeskart by default

[coderbyheart]

so we could easily add the depth value

via https://www.facebook.com/groups/223231326533154/posts/1124833473039597/?comment_id=1125368686319409&__cft__[0]=AZUq5We97vIdif2cXW5_w85VAX17wkj8Av1jSK8kiiyFxzZ1Fzx_Fdb45z_O8RFA2vNOeAeKTW3Cqg8TvSdgKQfQN5r9CVeTXT1fEx_4UBcP8r9YC2kK_sRk6nVdsfip7sC6hEPV4y00_VzFGpHbKA-J&__tn__=R]-R

[coderbyheart]

I also would like to use Norgeskart, but that would mean switching from MaplibreGL to Leaflet (https://www.kartverket.no/til.../kart/bygge-inn-kart-pa-nett) ... which I am not super familiar with.

[coderbyheart]

This is done: fjordcleanup/trash-web#22