docs: vf-hero imagery sizing and usage (#1734)

Closes #1641
3 jobs for develop in 8 minutes and 22 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #648310
docker
build

00:06:51

 
  Deploy
passed #648312
docker
deploy-aws-dev

00:00:54

passed #648311
docker
deploy-dev

00:01:30