Servd uses real environment variables to manage your application's configuration and secrets. We do not use .env files. This is because .env files need to be present on the filesystem which can make changes difficult in a high availability environment.
There's not too much difference though, you can still add, remove and edit environment variables for your Servd project via the dashboard.
In the Servd dashboard, select the project that you would like to change
Navigate to the Environment > Settings page for the environment that you're interested in
In the Environment Variables section, make your changes
To deploy your changes click the 'Sync' button at the top of the page