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

This reverts commit c92f4a5edd.

frontend/node_modules/eslint/lib/rules/utils/unicode/index.js

@@ -0,0 +1,16 @@
+/**
+ * @author Toru Nagashima <https://github.com/mysticatea>
+ */
+"use strict";
+
+const isCombiningCharacter = require("./is-combining-character");
+const isEmojiModifier = require("./is-emoji-modifier");
+const isRegionalIndicatorSymbol = require("./is-regional-indicator-symbol");
+const isSurrogatePair = require("./is-surrogate-pair");
+
+module.exports = {
+    isCombiningCharacter,
+    isEmojiModifier,
+    isRegionalIndicatorSymbol,
+    isSurrogatePair
+};