Step 10.3: Use module replacement to achieve component overrides

This is the same system as the customisations override, however deliberately using a different JSON file to avoid conflicts. 

Forks would be expected to use the customisations file, not the components file, to override/add components.

src/components/views/auth/VectorAuthFooter.tsx

@@ -44,6 +44,4 @@ const VectorAuthFooter = () => {
     );
 };
 
-VectorAuthFooter.replaces = 'AuthFooter';
-
 export default VectorAuthFooter;