refactor: use an enum with Logo size

src/components/Loading/Loading.tsx

@@ -1,6 +1,6 @@
 import React from 'react';
 
-import Logo from '../Logo';
+import Logo, { Size } from '../Logo';
 import Spinner from '../Spinner';
 
 import { Wrapper, Badge } from './styles';
@@ -8,7 +8,7 @@ import { Wrapper, Badge } from './styles';
 const Loading: React.FC = () => (
   <Wrapper>
     <Badge>
-      <Logo md={true} />
+      <Logo size={Size.Big} />
     </Badge>
     <Spinner />
   </Wrapper>