remove manually created typing d ts file (#249)

* Rename file

".d.ts" files are files that are automatically generated during compilation (in case option is set) and shouldn't be created manually.

* Export types and interfaces

* Add missing imports

src/components/manga/MangaDetails.tsx

@@ -16,6 +16,7 @@ import React from 'react';
 import { mutate } from 'swr';
 import client from 'util/client';
 import useLocalStorage from 'util/useLocalStorage';
+import { IManga, ISource } from 'typings';
 
 const useStyles = (inLibrary: boolean) =>
     makeStyles((theme: Theme) => ({