Finish making numbering declarative

src/file/file.ts

@@ -71,9 +71,13 @@ export class File {
         sections: ISectionOptions[] = [],
     ) {
         this.coreProperties = new CoreProperties(options);
-        this.numbering = new Numbering({
-            levels: options.numbering ? options.numbering.levels : [],
-        });
+        this.numbering = new Numbering(
+            options.numbering
+                ? options.numbering
+                : {
+                      config: [],
+                  },
+        );
         this.docRelationships = new Relationships();
         this.fileRelationships = new Relationships();
         this.appProperties = new AppProperties();