Refactor CSS pt. 1 (remove custom css in favour of Bootstrap's)

app/javascript/components/shared/CommentsNumber.tsx

@@ -0,0 +1,14 @@
+import * as React from 'react';
+
+interface Props {
+  number: number;
+}
+
+const CommentsNumber = ({ number }: Props) => (
+  <div className="d-flex">
+    <span className="comment icon"></span>
+    <span>{`${number} comment${number === 1 ? '' : 's'}`}</span>
+  </div>
+);
+
+export default CommentsNumber;