added css overdide option

src/main.rs

@@ -76,6 +76,7 @@ pub struct WikiConfig {
     pub image: Option<String>,
     pub infobox: Option<IndexMap<String, String>>,
     pub content_file: Option<String>,
+    pub css_override: Option<String>,
 }
 
 struct AppState {

src/rendering.rs

@@ -220,6 +220,7 @@ pub async fn render_wiki_page(
     context.insert("next_page", &next);
     context.insert("no_navigation", &no_navigation);
     context.insert("is_static", &is_static);
+    context.insert("css_override", &config.css_override);
 
     TEMPLATES
         .render("page.html", &context)