v5.0.0-beta.10

Fixed an issue with static assets being copied twice if they were nested in the static.source directory.

For example this:

src/images
  /v1/hero.jpg
  logo.jpg

... was copied over to this:

build_production/images
  /v1/hero.jpg
  hero.jpg # this shouldn't be here!
  logo.jpg

• fix: copying static assets 43c28b6

v5.0.0-beta.9...v5.0.0-beta.10