Show instance name beside community name in post teaser

To really be consistent with lemmy, this instance info is displayed only when a community is remote and remains hidden when a community is local. I added some css classes to make that distinction possible as part of the PR. So, to achieve that, here is the css you would want:

.community_instance {  
  display: inline;  
}  

.community_instance.local {  
  display: none;  
}