fix: bump author padding (#106)

use 0.5rem spacing

Author: ctjlewis

packages/react-tweet/src/twitter-theme/tweet-header.module.css

@@ -39,7 +39,7 @@
   display: flex;
   flex-direction: column;
   justify-content: center;
-  margin: 0 0.25rem;
+  margin: 0 0.5rem;
 }
 .authorLink {
   text-decoration: none;