chore: remove unused environment variable

Author: OliverDudgeon

.env.local.example

@@ -8,11 +8,6 @@ BASE_PATH='/data-manager-ui'
 # NextJS will use a standalone output by default
 DONT_USE_STANDALONE_OUTPUT=false
 
-# URL where shared assets are stored
-# This should point to the host of the Squonk home page on your domain or to
-# https://squonk.informaticsmatters.org where CORS can be disabled for your host.
-ASSET_URL='https://squonk.informaticsmatters.org'
-
 # This option is provided only to allow a local build of the full stack
 # when you have self-signed SSL certificates.
 # IT MUST BE DISABLED IN REAL PRODUCTION ENVIONMENTS