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

This reverts commit c92f4a5edd.

frontend/node_modules/flatpickr/dist/esm/l10n/ja.js

@@ -0,0 +1,58 @@
+var fp = typeof window !== "undefined" && window.flatpickr !== undefined
+    ? window.flatpickr
+    : {
+        l10ns: {},
+    };
+export var Japanese = {
+    weekdays: {
+        shorthand: ["日", "月", "火", "水", "木", "金", "土"],
+        longhand: [
+            "日曜日",
+            "月曜日",
+            "火曜日",
+            "水曜日",
+            "木曜日",
+            "金曜日",
+            "土曜日",
+        ],
+    },
+    months: {
+        shorthand: [
+            "1月",
+            "2月",
+            "3月",
+            "4月",
+            "5月",
+            "6月",
+            "7月",
+            "8月",
+            "9月",
+            "10月",
+            "11月",
+            "12月",
+        ],
+        longhand: [
+            "1月",
+            "2月",
+            "3月",
+            "4月",
+            "5月",
+            "6月",
+            "7月",
+            "8月",
+            "9月",
+            "10月",
+            "11月",
+            "12月",
+        ],
+    },
+    time_24hr: true,
+    rangeSeparator: " から ",
+    monthAriaLabel: "月",
+    amPM: ["午前", "午後"],
+    yearAriaLabel: "年",
+    hourAriaLabel: "時間",
+    minuteAriaLabel: "分",
+};
+fp.l10ns.ja = Japanese;
+export default fp.l10ns;