refactor structure

data/default_bus_layout.tres

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+[gd_resource type="AudioBusLayout" format=3 uid="uid://c4bwiq14nq074"]
+
+[resource]
+bus/1/name = &"SFX"
+bus/1/solo = false
+bus/1/mute = false
+bus/1/bypass_fx = false
+bus/1/volume_db = 0.0
+bus/1/send = &"Master"
+bus/2/name = &"Music"
+bus/2/solo = false
+bus/2/mute = false
+bus/2/bypass_fx = false
+bus/2/volume_db = 0.0
+bus/2/send = &"Master"

data/sources.yaml

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+---
+- fileName: assets/audio/music/Space Horror InGame Music (Exploration) _Clement Panchout.wav
+  commonUrl: https://clement-panchout.itch.io/yet-another-free-music-pack
+- fileName: assets/audio/sfx/817587__silverdubloons__tick06.wav
+  commonUrl: https://freesound.org/people/SilverDubloons/sounds/817587/
+- fileName: assets/textures/backgrounds/beanstalk-dark.webp
+  commonUrl: https://www.toptal.com/designers/subtlepatterns/beanstalk-dark-pattern/
+- fileName: assets/sprites/characters/skeleton
+  commonUrl: https://jesse-m.itch.io/skeleton-pack
+- fileName: assets/sprites/gems
+  commonUrl: https://ilustragm.itch.io/gems-icon-01-free