[Regression] Useless Toon Shading Option

[sylv256]

Describe the bug:
The toon shading option is useless. Either re-implement it, or remove it from the options and the README.md.

Where/when the bug happens or doesn't happen:
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Screenshots or link to video:
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Environment:

• Lumi Lights release version or link to commit: ...
• Canvas debug info from latest.log [see example]:

(paste here)

Content of .minecraft/canvas_shader_debug/failed/ if present (put "N/A" otherwise):
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Additional context:
Removed in commit 1c102a7