Update README config section

server/internal/app/config.go

@@ -16,7 +16,6 @@ type Config struct {
 	WorkDir           string
 	StaticPath        string
 	Port              string
-	RootURL           string
 	Domain            string
 	CORSOrigins       []string
 	AdminEmail        string
@@ -90,10 +89,6 @@ func LoadConfig() (*Config, error) {
 		config.Port = port
 	}
 
-	if rootURL := os.Getenv("LEMMA_ROOT_URL"); rootURL != "" {
-		config.RootURL = rootURL
-	}
-
 	if domain := os.Getenv("LEMMA_DOMAIN"); domain != "" {
 		config.Domain = domain
 	}