Add Team Description to the Team Settings (#4652)

* draft

* Add Team Description to the Team Settings

* add tooltips for team description

* made changes per PM review

* add message when there is no description set in the team

* squash

webapp/sass/routes/_signup.scss

@@ -481,7 +481,8 @@
         overflow: hidden;
         text-overflow: ellipsis;
         white-space: nowrap;
-        width: 90%;
+        width: calc(100% - 50px);
+
     }
 
     .signup-team__icon {
@@ -497,6 +498,15 @@
             right: -2px;
             top: 16px;
         }
+
+        &.fa-info-circle {
+            float: left;
+            line-height: 1.5em;
+            margin-right: .3em;
+            padding-left: .5em;
+            font-size: 1.5em;
+            top: 11px;
+        }
     }
 }