[Glitch] Admission-based registrations mode

Port SCSS changes from 51e154f5e8 to glitch-soc

app/javascript/flavours/glitch/styles/admin.scss

@@ -705,3 +705,11 @@ a.name-tag,
   overflow: hidden;
   text-overflow: ellipsis;
 }
+
+.ellipsized-ip {
+  display: inline-block;
+  max-width: 120px;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  vertical-align: middle;
+}