fix: use correct commiter avatars

User data from commits has different details than from activity. Commit data has much less information about authors and some of it is stored under different keys.

The only values that matter are:

- login: same in both
- avatar URL: avatar_url for ACTIVITY, avatarUrl for COMMIT
- activity count: added by the script, always as activityCount

Author: krzysdz

template/js/index.js

@@ -101,7 +101,7 @@ require('nighthawk')({
                 <li>
                   <a href="https://www.github.com/${user.login}" target="_blank">
                     <span class="avatar">
-                      <img src="${user.avatar_url}" />
+                      <img src="${user.avatar_url || user.avatarUrl}" />
                     </span>
                     @${user.login}
                   </a>: ${user.activityCount} contribution