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/molecules/DownloadStateIndicator.tsx

@@ -10,6 +10,7 @@ import { CircularProgress } from '@mui/material';
 import Typography from '@mui/material/Typography';
 import { Box } from '@mui/system';
 import React from 'react';
+import { IDownloadChapter } from 'typings';
 
 interface DownloadStateIndicatorProps {
     download: IDownloadChapter;