SEO fixes and style fixes.

src/admin.rs

@@ -792,6 +792,7 @@ struct SettingsForm {
     contact_info: String,
     pricing_info: String,
     timezone: String,
+    site_domain: String,
 }
 
 async fn save_settings(request: Request, session: Session, db: Database) -> cot::Result<Response> {
@@ -807,6 +808,7 @@ async fn save_settings(request: Request, session: Session, db: Database) -> cot:
         ("contact_info", form.contact_info),
         ("pricing_info", form.pricing_info),
         ("timezone", form.timezone),
+        ("site_domain", form.site_domain),
     ] {
         let k = key.to_string();
         let existing = query!(Setting, $key == k).get(&db).await?;