Add support for SSL in development (#5668)

.env.sample

@@ -30,7 +30,7 @@ REDIS_URL=redis://localhost:6379
 
 # URL should point to the fully qualified, publicly accessible URL. If using a
 # proxy the port in URL and PORT may be different.
-URL=http://localhost:3000
+URL=https://app.outline.dev:3000
 PORT=3000
 
 # See [documentation](docs/SERVICES.md) on running a separate collaboration