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

This reverts commit c92f4a5edd.

frontend/node_modules/@fullcalendar/react/dist/index.d.ts

@@ -0,0 +1,26 @@
+import React, { Component } from 'react';
+import { CalendarOptions, CalendarApi } from '@fullcalendar/core';
+import { CustomRendering } from '@fullcalendar/core/internal';
+interface CalendarState {
+    customRenderingMap: Map<string, CustomRendering<any>>;
+}
+export default class FullCalendar extends Component<CalendarOptions, CalendarState> {
+    static act: typeof runNow;
+    private elRef;
+    private calendar;
+    private handleCustomRendering;
+    private resizeId;
+    private isUpdating;
+    private isUnmounting;
+    state: CalendarState;
+    render(): React.JSX.Element;
+    componentDidMount(): void;
+    componentDidUpdate(): void;
+    componentWillUnmount(): void;
+    requestResize: () => void;
+    doResize(): void;
+    cancelResize(): void;
+    getApi(): CalendarApi;
+}
+declare function runNow(f: () => void): void;
+export {};