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

frontend/node_modules/yaml/dist/compose/util-map-includes.js

@@ -1,15 +0,0 @@
-'use strict';
-
-var identity = require('../nodes/identity.js');
-
-function mapIncludes(ctx, items, search) {
-    const { uniqueKeys } = ctx.options;
-    if (uniqueKeys === false)
-        return false;
-    const isEqual = typeof uniqueKeys === 'function'
-        ? uniqueKeys
-        : (a, b) => a === b || (identity.isScalar(a) && identity.isScalar(b) && a.value === b.value);
-    return items.some(pair => isEqual(pair.key, search));
-}
-
-exports.mapIncludes = mapIncludes;