remove un-used function

src/db.rs

@@ -43,10 +43,6 @@ impl Website {
         &mut self.site
     }
 
-    pub fn domain_str(&self) -> &str {
-        self.site.as_str()
-    }
-
     #[instrument(skip_all)]
     pub async fn links_to(&self, other: Vec<Thing>, db: &Surreal<Client>) {
         let len = other.len();