Fix header and project home ui for mobile

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/assets/stylesheets/sections/header.scss

@@ -59,6 +59,7 @@ header {
       }
 
       .navbar-collapse {
+        margin-top: 47px;
         padding-right: 0;
         padding-left: 0;
       }

app/assets/stylesheets/sections/nav.scss

@@ -63,7 +63,6 @@
   @media (max-width: $screen-xs-max) {
     font-size: 18px;
     margin: 0;
-
     max-height: none;
 
     &, .container {
@@ -86,6 +85,7 @@
             color: #fff;
             font-weight: normal;
             text-shadow: none;
+            border: none;
 
             &:after { display: none; }
           }

app/assets/stylesheets/sections/projects.scss

@@ -295,3 +295,16 @@ ul.nav.nav-projects-tabs {
     }
   }
 }
+
+@media (max-width: $screen-xs-max) {
+  .project-home-panel {
+    .star-fork-buttons {
+      padding-top: 10px;
+      padding-right: 15px;
+    }
+  }
+
+  .project-home-links {
+    display: none;
+  }
+}

app/views/projects/_home_panel.html.haml

@@ -31,7 +31,7 @@
           - else
             = link_to_toggle_star('You must sign in to star a project.', false, false)
 
-  .project-home-row
+  .project-home-row.hidden-xs
     - if current_user && !empty_repo
       .project-home-dropdown
         = render "dropdown"