router and initialisation update

Yesterday got stuck on a few bugs - but now everything should work much more stably and without glitches.

1. Rewrote custom router to go_router
2. Fixed a tricky bug where the hot air balloon appeared below the level and got stuck in it 😅
3. Fixed level loading and reloading and added loaders
4. Added basic points at the start of the level, so that every user has the opportunity to remove at least one letter even on his first move