Don't show intro text on details page

app/styles/components/_contribution-details.scss

@@ -86,7 +86,7 @@ section#contribution-details {
   }
 }
 
-// On small screens, hide contributor and contributions list when
+// On small screens, hide intro text, contributor and contributions list when
 // showing details
 @include media-max(small) {
   #dashboard.with-details {
@@ -94,4 +94,7 @@ section#contribution-details {
       display: none;
     }
   }
+  #intro.with-details {
+    display: none;
+  }
 }

app/templates/dashboard.hbs

@@ -1,5 +1,5 @@
 {{#if showIntroText}}
-  <div id="intro">
+  <div id="intro" class={{if showDetailsPane "with-details"}}>
     <h2>
       Welcome to the contribution dashboard of the
       <a href="https://kosmos.org" target="_blank" rel="noopener">Kosmos</a> project!