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/navbar/NavBarContextProvider.tsx

@@ -7,6 +7,7 @@
 
 import React, { useState } from 'react';
 import NavBarContext from 'components/context/NavbarContext';
+import { INavbarOverride } from 'typings';
 
 interface IProps {
     children: React.ReactNode;