Function rewrite_homepage_links 

fn rewrite_homepage_links(
    text: &str,
    base_dir: &Path,
    root: &Path,
    src_to_url: &HashMap<(String, String), String>,
    repo: Option<&str>,
    commit: Option<&str>,
) -> String

Rewrite inline [text](url) markdown links in the homepage:

• .sol paths that resolve to a known page → vocs URL.
• Any other relative path under root → {repo}/blob/{commit}/....
• Absolute URLs, anchors, and unresolved targets are left untouched.