♻️ refactor: improve Zola v0.22.0 compatibility (#612)

config.toml

@@ -33,14 +33,16 @@ include_content = true
 index_format = "elasticlunr_json"
 
 [markdown]
-highlight_code = true
 bottom_footnotes = true
-# To use a Zola built-in theme, CSP needs to allow unsafe-inline for style-src.
-highlight_theme = "css"
 smart_punctuation = true
 # Set to 'external' to add an indicator next to external links.
 external_links_class = "external"
 
+[markdown.highlighting]
+theme = "catppuccin-frappe"
+style = "class"
+error_on_missing_language = true
+
 [link_checker]
 internal_level = "warn"
 skip_prefixes = [