Add yet-another-react-lightbox package and update .gitignore to exclude node_modules

frontend/node_modules/classnames/index.d.ts

@@ -1,32 +0,0 @@
-// LICENSE is MIT
-//
-// Copyright (c) 2018
-//   Dave Keen <http://www.keendevelopment.ch>
-//   Adi Dahiya <https://github.com/adidahiya>
-//   Jason Killian <https://github.com/JKillian>
-//   Sean Kelley <https://github.com/seansfkelley>
-//   Michal Adamczyk <https://github.com/mradamczyk>
-//   Marvin Hagemeister <https://github.com/marvinhagemeister>
-
-declare namespace classNames {
-  type Value = string | number | boolean | undefined | null;
-  type Mapping = Record<string, any>;
-  interface ArgumentArray extends Array<Argument> {}
-  interface ReadonlyArgumentArray extends ReadonlyArray<Argument> {}
-  type Argument = Value | Mapping | ArgumentArray | ReadonlyArgumentArray;
-}
-
-interface ClassNames {
-	(...args: classNames.ArgumentArray): string;
-
-	default: ClassNames;
-}
-
-/**
- * A simple JavaScript utility for conditionally joining classNames together.
- */
-declare const classNames: ClassNames;
-
-export as namespace classNames;
-
-export = classNames;