Added typescript to etherpad

* Fixed determining file extension.

* Added ts-node

* Fixed backend tests.

* Fixed frontend test runs.

* Fixed tests.

* Use script approach for starting etherpad.

* Change directory to src.

* Fixed env.

* Change directory

* Fixed build arg.

* Fixed docker build.

* Fixed.

* Fixed cypress file path.

* Fixed.

* Use latest node container.

* Fixed windows workflow.

* Use tsx and optimized docker image.

* Added workflow for type checks.

* Fixed.

* Added tsconfig.

* Converted more files to typescript.

* Removed commented keys.

* Typed caching middleware.

* Added script for checking the types.

* Moved SecretRotator to typescript.

* Fixed npm installation and moved to types folder.

* Use better scripts for watching typescript changes.

* Update windows.yml

* Fixed order of npm installation.

* Converted i18n.

* Added more types.

* Added more types.

* Fixed import.

* Fixed tests.

* Fixed tests.

* Fixed type checking test.

* Fixed stats

* Added express types.

* fixed.

src/node/utils/customError.js

@@ -1,24 +0,0 @@
-'use strict';
-/**
- * CustomError
- *
- * This helper modules allows us to create different type of errors we can throw
- *
- * @class CustomError
- * @extends {Error}
- */
-class CustomError extends Error {
-  /**
-   * Creates an instance of CustomError.
-   * @param {*} message
-   * @param {string} [name='Error'] a custom name for the error object
-   * @memberof CustomError
-   */
-  constructor(message, name = 'Error') {
-    super(message);
-    this.name = name;
-    Error.captureStackTrace(this, this.constructor);
-  }
-}
-
-module.exports = CustomError;