chore: clean up folder naming

assets.tar.gz

frontend/.editorconfig

frontend/.gitattributes

frontend/.gitignore

frontend/.htaccess

frontend/.idea/.gitignore

frontend/.idea/inspectionProfiles/Project_Default.xml

frontend/.idea/modules.xml

frontend/.idea/oetzi_game.iml

frontend/img/.gitignore

frontend/package-lock.json

frontend/package.json

frontend/public/assets/background_layers/Layer_0000_9.png

frontend/public/assets/background_layers/Layer_0001_8.png

frontend/public/assets/background_layers/Layer_0002_7.png

frontend/public/assets/background_layers/Layer_0003_6.png

...end/public/assets/background_layers/Layer_0004_Lights.png

frontend/public/assets/background_layers/Layer_0005_5.png

frontend/public/assets/background_layers/Layer_0006_4.png

...end/public/assets/background_layers/Layer_0007_Lights.png