fix: export main image component

Author: calpa

src/components/index.ts

@@ -11,3 +11,4 @@ export { default as JapanMap } from "./JapanMap";
 export { default as List } from "./List";
 export { default as ListItem } from "./ListItem";
 export { default as Attraction } from "./Attraction";
+export { default as MainImage } from "./MainImage";