refactor: restructure in entirety

internal/server/server.go

@@ -10,20 +10,22 @@ import (
 	_ "github.com/joho/godotenv/autoload"
 
 	"billit/internal/database"
+	"io/fs"
 )
 
 type Server struct {
 	port int
 
-	db database.Service
+	db       database.Service
+	assetsFS fs.FS
 }
 
-func NewServer() *http.Server {
+func NewServer(assetsFS fs.FS) *http.Server {
 	port, _ := strconv.Atoi(os.Getenv("PORT"))
 	NewServer := &Server{
-		port: port,
-
-		db: database.New(),
+		port:     port,
+		db:       database.New(),
+		assetsFS: assetsFS,
 	}
 
 	// Declare Server config