clean up repositories; move viewmodel repo into own file;

src/internal/app/app.go

@@ -7,12 +7,14 @@ import (
 )
 
 type App struct {
-	articles *database.ArticleRepository
+	articles   *database.ArticleRepository
+	articleVMs *database.ArticleViewModelRepository
 }
 
 func NewApp(db *sql.DB) *App {
 	return &App{
-		articles: &database.ArticleRepository{DB: db},
+		articles:   &database.ArticleRepository{DB: db},
+		articleVMs: &database.ArticleViewModelRepository{DB: db},
 	}
 }