update: use new highlighting lib version

config.toml

@@ -7,17 +7,15 @@ title = "Ungol"
 generate_feeds = true
 
 [markdown]
-highlight_code = true
-highlight_theme = "css"
-highlight_themes_css = [
-  { theme = "Catppuccin-macchiato", filename = "syntax-theme-dark.css" },
-  { theme = "Catppuccin-latte", filename = "syntax-theme-light.css" },
-]
-extra_syntaxes_and_themes = ["highlight_themes"]
 bottom_footnotes = true
 insert_anchor_links = "right"
 render_emoji = true
 
+[markdown.highlighting]
+light_theme = "catppuccin-latte"
+dark_theme = "catppuccin-macchiato"
+style = "class"
+
 [slugify]
 paths = "safe"
 anchor = "safe"