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

frontend/node_modules/eslint/messages/plugin-conflict.js

@@ -1,22 +0,0 @@
-"use strict";
-
-module.exports = function(it) {
-    const { pluginId, plugins } = it;
-
-    let result = `ESLint couldn't determine the plugin "${pluginId}" uniquely.
-`;
-
-    for (const { filePath, importerName } of plugins) {
-        result += `
-- ${filePath} (loaded in "${importerName}")`;
-    }
-
-    result += `
-
-Please remove the "plugins" setting from either config or remove either plugin installation.
-
-If you still can't figure out the problem, please see https://eslint.org/docs/latest/use/troubleshooting.
-`;
-
-    return result;
-};