Function generate_f_template_with_css_options 

pub fn generate_f_template_with_css_options(
    tag_name: &str,
    html_content: &str,
    css_content: Option<&str>,
    css_strategy: CssStrategy,
    css_link_options: &CssLinkOptions,
) -> String

Generate a FAST 3 f-template with Link CSS filename/href options.