refactor: moved shader files

hypr/grayscale.glsl

@@ -1,14 +0,0 @@
-#version 320 es
-
-precision mediump float;
-in vec2 v_texcoord; // Use 'in' instead of 'varying'
-uniform sampler2D tex;
-
-out vec4 fragColor; // Use 'out' instead of 'gl_FragColor'
-
-void main() {
-  vec4 this_colour = texture(tex, v_texcoord); 
-  float new_colour = (this_colour.r + this_colour.g + this_colour.b) / 3.0;
-  fragColor = vec4(new_colour, new_colour, new_colour, 0.0);
-}
-