refactor(client): button to TypeScript

client/src/components/helpers/button-spacer.tsx

@@ -1,6 +1,6 @@
 import React from 'react';
 
-function ButtonSpacer() {
+function ButtonSpacer(): JSX.Element {
   return <div className='button-spacer' style={{ padding: '5px 0' }} />;
 }
 

client/src/components/helpers/index.js

@@ -1,4 +1,4 @@
-export { default as ButtonSpacer } from './ButtonSpacer';
+export { default as ButtonSpacer } from './button-spacer';
 export { default as FullWidthRow } from './full-width-row';
 export { default as SlimWidthRow } from './slim-width-row';
 export { default as Loader } from './loader';

client/src/templates/Introduction/Intro.js

@@ -7,7 +7,7 @@ import { useTranslation } from 'react-i18next';
 
 import LearnLayout from '../../components/layouts/Learn';
 import FullWidthRow from '../../components/helpers/full-width-row';
-import ButtonSpacer from '../../components/helpers/ButtonSpacer';
+import ButtonSpacer from '../../components/helpers/button-spacer';
 import { MarkdownRemark, AllChallengeNode } from '../../redux/prop-types';
 
 import './intro.css';