Function app_route_page_html 

fn app_route_page_html(
    app: &AppRuntime,
    route: &Value,
    target: &str,
    actor_id: i64,
    has_user: bool,
    managed_business_count: i64,
    error_message: Option<&str>,
    csrf_token: &str,
) -> Option<String>

Performs app route page HTML.