build: remove broken scripts

These two scripts are broken and can cause data loss. Remove them.

They are not in the launcher script, but _are_ available to users in the terminal/file browser.

Hopefully, when we removing them here, `pip` will delete them on next installation of the package...

pyproject.toml

@@ -130,8 +130,6 @@ dependencies = [
 
 [project.scripts]
 "invokeai-web" = "invokeai.app.run_app:run_app"
-"invokeai-import-images" = "invokeai.frontend.install.import_images:main"
-"invokeai-db-maintenance" = "invokeai.backend.util.db_maintenance:main"
 
 [project.urls]
 "Homepage" = "https://invoke-ai.github.io/InvokeAI/"