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/library/LibraryMangaGrid.tsx

@@ -11,6 +11,7 @@ import MangaGrid from 'components/MangaGrid';
 import { useLibraryOptionsContext } from 'components/context/LibraryOptionsContext';
 import { StringParam, useQueryParam } from 'use-query-params';
 import { useMediaQuery, useTheme } from '@mui/material';
+import { IMangaCard, LibrarySortMode, NullAndUndefined } from 'typings';
 
 const FILTERED_OUT_MESSAGE = 'There are no Manga matching this filter';