add migration file

packages/app/src/migrations/20230213090921-remove-presentation-configurations.js

@@ -0,0 +1,36 @@
+// eslint-disable-next-line import/no-named-as-default
+import Config from '~/server/models/config';
+import { getMongoUri, mongoOptions } from '~/server/util/mongoose-utils';
+import loggerFactory from '~/utils/logger';
+
+
+const logger = loggerFactory('growi:remove-presentation-configurations');
+
+const mongoose = require('mongoose');
+
+module.exports = {
+  async up() {
+    logger.info('Apply migration');
+    mongoose.connect(getMongoUri(), mongoOptions);
+
+    await Config.findOneAndDelete({ key: 'markdown:presentation:pageBreakSeparator' });
+    await Config.findOneAndDelete({ key: 'markdown:presentation:pageBreakCustomSeparator' });
+
+    logger.info('Migration has successfully applied');
+  },
+
+  async down() {
+    logger.info('Rollback migration');
+    mongoose.connect(getMongoUri(), mongoOptions);
+
+    const insertConfig = new Config({
+      ns: 'crowi',
+      key: 'markdown:presentation:pageBreakSeparator',
+      value: 2,
+    });
+
+    await insertConfig.save();
+
+    logger.info('Migration has been successfully rollbacked');
+  },
+};