[chore] DuckDB demo app

[igorDykhta]

• [ ] NOT FOR MASTER BRANCH !!! DON'T MERGE. THIS BRANCH IS USED FOR kepler-preview.foursquare.com

• [x] inject DuckDb plugin and DuckDb table

• [x] disable not configured cloud storage providers - Dropbox, Carto

• [x] disable release banner

• [x] disable progressive arrow data loading which doesn't work with DuckDB

• [x] show Example data panel by default

• [x] move tileset examples to the top, remove trips example

• [x] fix for custom domains under SPA page / netlify

[Aarebecca]

问题应该是拖拽和缩放交互没有考虑到画布旋转导致的

[Like-thewind]

problem+1