refactor(frontend): 🔥 rewrite backup UI for new page base components

Removed old split code and used the composition api to to re-write the import/export functionality of mealie.

frontend/api/class-interfaces/utils.ts

@@ -0,0 +1,20 @@
+import { BaseAPI } from "./_base";
+
+const prefix = "/api";
+
+export class UtilsAPI extends BaseAPI {
+  async download(url: string) {
+    const { response } = await this.requests.get(url);
+
+    if (!response) {
+      return;
+    }
+
+    // @ts-ignore
+    const token: String = response.data.fileToken;
+
+    const tokenURL = prefix + "/utils/download?token=" + token;
+    window.open(tokenURL, "_blank");
+    return await response;
+  }
+}