Made category optional on Snippet table

prisma/migrations/20230201191654_cate_on_snipp_optional/migration.sql

@@ -0,0 +1,8 @@
+-- DropForeignKey
+ALTER TABLE `Snippet` DROP FOREIGN KEY `Snippet_category_id_fkey`;
+
+-- AlterTable
+ALTER TABLE `Snippet` MODIFY `category_id` INTEGER NULL;
+
+-- AddForeignKey
+ALTER TABLE `Snippet` ADD CONSTRAINT `Snippet_category_id_fkey` FOREIGN KEY (`category_id`) REFERENCES `Category`(`id`) ON DELETE SET NULL ON UPDATE CASCADE;