remove ravu-zoom-chroma shaders

It turns out that chroma upscaling with only kernel classification guided by luma is not very effective, compare to bilateral chroma upscalers like KrigBilateral and JointBilateral. Please use those shaders instead.
bjin · Jul 29, 2023 · da5d3c5 · da5d3c5
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diff --git a/README.md b/README.md
@@ -63,9 +63,6 @@ video and will fail on others (for example, PNG picture).
 directly. Its sharpness is close to `ravu-lite`. But it renders at target
 resolution, so expect it to be much slower than `ravu` for perfect 2x upscaling.
 
-`ravu-zoom` also comes with a `chroma` variant which is mostly a drop-in replacement of
-`--cscale`.
-
 # Known Issue
 
 1. `ravu-lite` is incompatible with `--fbo-format=rgb10_a2` (default

diff --git a/compute/ravu-zoom-r2-chroma.hook b/compute/ravu-zoom-r2-chroma.hook
diff --git a/compute/ravu-zoom-r3-chroma.hook b/compute/ravu-zoom-r3-chroma.hook
diff --git a/ravu-zoom-r2-chroma.hook b/ravu-zoom-r2-chroma.hook
diff --git a/ravu-zoom-r3-chroma.hook b/ravu-zoom-r3-chroma.hook
diff --git a/vulkan/compute/ravu-zoom-r2-chroma.hook b/vulkan/compute/ravu-zoom-r2-chroma.hook
diff --git a/vulkan/compute/ravu-zoom-r3-chroma.hook b/vulkan/compute/ravu-zoom-r3-chroma.hook
diff --git a/vulkan/ravu-zoom-r2-chroma.hook b/vulkan/ravu-zoom-r2-chroma.hook
diff --git a/vulkan/ravu-zoom-r3-chroma.hook b/vulkan/ravu-zoom-r3-chroma.hook