MDL-55802 output: Hide site name and user name on xs screens

Part of MDL-55071

theme/noname/scss/moodle/core.scss

@@ -1652,6 +1652,12 @@ img#persona_signin {
     height: 43px;
 }
 
+@include media-breakpoint-down(xs) {
+    .navbar-brand .site-name {
+        display: none;
+    }
+}
+
 /** Page header */
 #page-header {
     .logo {

theme/noname/scss/moodle/modules.scss

@@ -333,7 +333,9 @@ div#dock {
                     .role {
                         font-weight: bold;
                     }
+
                 }
+
             }
 
             // Hide caret when JS is disabled.
@@ -345,6 +347,11 @@ div#dock {
 
     }
 }
+@include media-breakpoint-down(sm) {
+    .usertext {
+        display: none;
+    }
+}
 .jsenabled {
     .usermenu {
         .moodle-actionmenu {