Remove README.ru

Author: 343dev

README.md

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 It can compress PNG, JPEG, GIF, and SVG lossy or lossless, and create AVIF and WebP versions for raster images.
 
-[По-русски](./README.ru.md)
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 ## Rationale
 
 As frontend developers, we have to care about pictures: compress PNG and JPEG, remove useless parts of SVG, create AVIF and WebP for modern browsers, and so on. One day, we got tired of using a bunch of apps for that, and created one tool that does everything we want.