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

frontend/node_modules/preact/compat/scheduler.js

@@ -1,15 +0,0 @@
-// see scheduler.mjs
-
-function unstable_runWithPriority(priority, callback) {
-	return callback();
-}
-
-module.exports = {
-	unstable_ImmediatePriority: 1,
-	unstable_UserBlockingPriority: 2,
-	unstable_NormalPriority: 3,
-	unstable_LowPriority: 4,
-	unstable_IdlePriority: 5,
-	unstable_runWithPriority,
-	unstable_now: performance.now.bind(performance)
-};