Expose Specific Environmental Variables to The Client Using Remix

We want to make it so that only admins can access the admin routes. To do that, we need to add support for environment variables. Using Remix, we can choose which environment variables to expose to our front or backend.

Using an env.server file, we can create a function that returns an admin email address that we can use for accessing those admin routes. This will allow the front-end access to an env variable. You can still use regular env variables for server-side.