Convert channel_members and channel_invite modals to react boostrap to fix performance issues

web/templates/channel.html

@@ -25,8 +25,6 @@
   <div id="new_channel_modal"></div>
   <div id="post_deleted_modal"></div>
   <div id="channel_notifications_modal"></div>
-  <div id="channel_members_modal"></div>
-  <div id="channel_invite_modal"></div>
   <div id="team_members_modal"></div>
   <div id="direct_channel_modal"></div>
   <div id="channel_info_modal"></div>