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/reader/DoublePage.tsx

@@ -7,6 +7,7 @@
 
 import React from 'react';
 import { Box, styled } from '@mui/system';
+import { IReaderSettings } from 'typings';
 
 const Image = styled('img')({
     marginBottom: 0,