add limit to index page, for performance improvements

internal/model/database/articles.go

@@ -11,13 +11,14 @@ type ArticleModel struct {
 
 // Gets all the article objects from the database. This may throw an error if
 // the connection to the database fails.
-func (m *ArticleModel) All() ([]model.Article, error) {
+func (m *ArticleModel) All(limit int) ([]model.Article, error) {
 	stmt := `
         SELECT id, title, sourceUrl, author, content, publishDate, fetchDate 
         FROM articles 
         ORDER BY publishDate DESC
+		LIMIT $1
     `
-	rows, err := m.DB.Query(stmt)
+	rows, err := m.DB.Query(stmt, limit)
 	if err != nil {
 		return nil, err
 	}