Direct avatar rendering (#13649)

* Direct avatar rendering

This adds new template helpers for avatar rendering which output image
elements with direct links to avatars which makes them cacheable by the
browsers.

This should be a major performance improvment for pages with many avatars.

* fix avatars of other user's profile pages

* fix top border on user avatar name

* uncircle avatars

* remove old incomplete avatar selector

* use title attribute for name and add it back on blame

* minor refactor

* tweak comments

* fix url path join and adjust test to new result

* dedupe functions

web_src/less/_organization.less

@@ -34,13 +34,15 @@
   }
 
   &.profile {
-    #org-avatar {
+    .org-avatar {
       width: 100px;
       height: 100px;
       margin-right: 15px;
     }
 
     #org-info {
+      overflow-wrap: anywhere;
+
       .ui.header {
         font-size: 36px;
         margin-bottom: 0;