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

frontend/node_modules/gensync/index.js.flow

@@ -1,32 +0,0 @@
-// @flow
-
-opaque type Next = Function | void;
-opaque type Yield = mixed;
-
-export type Gensync<Args, Return> = {
-  (...args: Args): Handler<Return>,
-  sync(...args: Args): Return,
-  async(...args: Args): Promise<Return>,
-  // ...args: [...Args, Callback]
-  errback(...args: any[]): void,
-};
-
-export type Handler<Return> = Generator<Yield, Return, Next>;
-export type Options<Args, Return> = {
-  sync(...args: Args): Return,
-  arity?: number,
-  name?: string,
-} & (
-  | { async?: (...args: Args) => Promise<Return> }
-  // ...args: [...Args, Callback]
-  | { errback(...args: any[]): void }
-);
-
-declare module.exports: {
-  <Args, Return>(
-    Options<Args, Return> | ((...args: Args) => Handler<Return>)
-  ): Gensync<Args, Return>,
-
-  all<Return>(Array<Handler<Return>>): Handler<Return[]>,
-  race<Return>(Array<Handler<Return>>): Handler<Return>,
-};