fix: suppress highlight language warnings if highlight_code is false (#2287)

The warning about unknown highlight languages was displayed even when
code highlighting was disabled via `markdown.highlight_code = false`.
This commit adds a condition to check this setting before issuing the
warning, effectively suppressing it when code highlighting is disabled.

Issue: #2280

Author: welpo

components/markdown/src/codeblock/mod.rs

@@ -77,7 +77,7 @@ impl<'config> CodeBlock<'config> {
         path: Option<&'config str>,
     ) -> (Self, String) {
         let syntax_and_theme = resolve_syntax_and_theme(fence.language, config);
-        if syntax_and_theme.source == HighlightSource::NotFound {
+        if syntax_and_theme.source == HighlightSource::NotFound && config.markdown.highlight_code {
             let lang = fence.language.unwrap();
             if let Some(p) = path {
                 eprintln!("Warning: Highlight language {} not found in {}", lang, p);