use project geometry

[Hagellach37]

on the project.html page we currently load the geometry for all projects:
https://github.com/mapswipe/website/blob/f3c061b0d32a774847188c214fc094fc850fd859/assets/js/projectStats.js#L8

However, we only need to display the geometry of the selected project. This is now provided by our api:
https://apps.mapswipe.org/api/project_geometries/

(and it seems that project.html is not currently part of your gulp website compile thing...)