make the search function pure instead of calling renderTable

frontend/files/index.html

@@ -36,15 +36,11 @@
                   `.01.LZZ.jpg`;
               }
             });
-            return books;
-          })
-          .then((books) => {
             document.getElementById("search").addEventListener("input", (e) => {
-              search(books, e.target.value);
+              renderTable(search(books, e.target.value));
             });
-            return books;
-          })
-          .then(renderTable);
+            renderTable(books);
+          });
       }
 
       function search(books, searchBy) {
@@ -63,7 +59,7 @@
             }
           );
         }
-        renderTable(books);
+        return books;
       }
 
       function renderTable(books, sortField) {