Created Vignettes around chapter titles (markdown)

Vignettes-around-chapter-titles.md

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+This style tweak draws pretty vignettes around the chapter titles in KOReader.
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+Put the CSS file from the archive to koreader/styletweaks/ directory and restart KOReader.
+Then enable it from Top Menu - Second tab - Style Tweaks - User Style Tweaks.
+[KOReader_Vignettes.zip](https://disk.yandex.com/d/zI2cZ_4TUZAk3w)
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+Vignettes are drawn only around h1/h2/h3 chapter titles in epub books and their respective equivalents in fb2 books.
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+(!) For books with many chapters this style tweak might severely reduce each opening of the document.
+Especially beware enabling this tweak to "Apply to all books".
+
+See example below:
+![Screenshot_20230701-133823](https://github.com/koreader/koreader/assets/6279855/36d4176d-b5eb-4340-9926-4a04f7c23096)