refactor(database): get rid of the sqlite tentative

internal/database/sqlite.go

@@ -1,26 +0,0 @@
-//go:build sqlite
-
-// SPDX-FileCopyrightText: Copyright The Miniflux Authors. All rights reserved.
-// SPDX-License-Identifier: Apache-2.0
-
-package database // import "miniflux.app/v2/internal/database"
-
-import (
-	"database/sql"
-	"time"
-
-	_ "github.com/mattn/go-sqlite3"
-)
-
-// NewConnectionPool configures the database connection pool.
-func NewConnectionPool(dsn string, _, _ int, _ time.Duration) (*sql.DB, error) {
-	db, err := sql.Open("sqlite3", dsn)
-	if err != nil {
-		return nil, err
-	}
-	return db, nil
-}
-
-func getDriverStr() string {
-	return "sqlite3"
-}