add annual link

src/handlers/handlers.rs

@@ -35,6 +35,7 @@ lazy_static! {
 pub async fn get_signup() -> impl IntoResponse {
     SignupPage {
         monthly_link: Some((*MONTHLY_LINK).to_string()),
+        annual_link: Some((&*ANNUAL_LINK).to_string()),
         ..Default::default()
     }
 }