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

This reverts commit c92f4a5edd.

frontend/node_modules/flatpickr/dist/utils/index.d.ts

@@ -0,0 +1,8 @@
+export declare const pad: (number: string | number, length?: number) => string;
+export declare const int: (bool: boolean) => 1 | 0;
+export declare function debounce<F extends Function>(fn: F, wait: number): (this: any) => void;
+export declare const arrayify: <T>(obj: T | T[]) => T[];
+export declare type IncrementEvent = MouseEvent & {
+    delta: number;
+    type: "increment";
+};