Update README.md

Update nbs_player_rs.wasm binary file to reflect recent changes

Prevent background shader time update when the song is paused

Update stripes factor and simplify color mixing in water fall background shader

Add water fall background shader and integrate into background loading logic

Refactor color blending in voronoise background shader for improved visual consistency

Add sand and voronoise background shaders with integration into background loading logic

Add grass background shader and integrate into background loading logic

Remove unused shader location variables and commented-out shader code

Update README to reflect new default font and background settings

Add background shader implementation and integrate into AppState

Refactor font loading to use FontID enum and update shader to use plain background

Update shader implementation to use fire background shader and adjust speed uniform for enhanced visual effects

Refactor fire background shader for improved noise function and performance; add plain background shader

Add water background shader implementation for dynamic visuals