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/sk.js

@@ -0,0 +1,57 @@
+var fp = typeof window !== "undefined" && window.flatpickr !== undefined
+    ? window.flatpickr
+    : {
+        l10ns: {},
+    };
+export var Slovak = {
+    weekdays: {
+        shorthand: ["Ned", "Pon", "Ut", "Str", "Štv", "Pia", "Sob"],
+        longhand: [
+            "Nedeľa",
+            "Pondelok",
+            "Utorok",
+            "Streda",
+            "Štvrtok",
+            "Piatok",
+            "Sobota",
+        ],
+    },
+    months: {
+        shorthand: [
+            "Jan",
+            "Feb",
+            "Mar",
+            "Apr",
+            "Máj",
+            "Jún",
+            "Júl",
+            "Aug",
+            "Sep",
+            "Okt",
+            "Nov",
+            "Dec",
+        ],
+        longhand: [
+            "Január",
+            "Február",
+            "Marec",
+            "Apríl",
+            "Máj",
+            "Jún",
+            "Júl",
+            "August",
+            "September",
+            "Október",
+            "November",
+            "December",
+        ],
+    },
+    firstDayOfWeek: 1,
+    rangeSeparator: " do ",
+    time_24hr: true,
+    ordinal: function () {
+        return ".";
+    },
+};
+fp.l10ns.sk = Slovak;
+export default fp.l10ns;