Don't include deleted or empty articles in list

models/article.ts

@@ -48,6 +48,14 @@ export default class Article {
     return this.event.created_at;
   }
 
+  get content(): string {
+    return this.event.content;
+  }
+
+  get isDeleted(): boolean {
+    return !!this.event.tags.find((t) => t[0] === "deleted");
+  }
+
   get naddr(): string {
     return nip19.naddrEncode({
       identifier: this.identifier,