Improve network UI

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

app/assets/stylesheets/sections/graph.scss

 .project-network {
   border: 1px solid #CCC;
 
-  .tip {
+  .controls {
     color: #888;
     font-size: 14px;
-    padding: 10px;
+    padding: 5px;
     border-bottom: 1px solid #bbb;
     background: #EEE;
   }

app/views/projects/network/_head.html.haml

-.row.append-bottom-20
-  .col-md-2.append-bottom-10
+.append-bottom-20
   = render partial: 'shared/ref_switcher', locals: {destination: 'graph'}
-  .col-md-10
-    = form_tag project_network_path(@project, @id), method: :get, class: 'form-inline network-form' do |f|
-      = label_tag :extended_sha1 , "Looking for", class: 'light inline-label'
-      = text_field_tag :extended_sha1, @options[:extended_sha1], placeholder: "Input an extended SHA1 syntax", class: "search-input form-control input-mx-250"
-      = button_tag type: 'submit', class: 'btn btn-success' do
-        %i.icon-search
-
-      .inline.prepend-left-20
-        .checkbox.light
-          = label_tag :filter_ref do
-            = check_box_tag :filter_ref, 1, @options[:filter_ref]
-            %span Begin with the selected commit
+  .pull-right.visible-lg.light You can move around the graph by using the arrow keys.

app/views/projects/network/show.html.haml

 = render "head"
 .project-network
-  .tip
-    You can move around the graph by using the arrow keys.
+  .controls
+    = form_tag project_network_path(@project, @id), method: :get, class: 'form-inline network-form' do |f|
+      = text_field_tag :extended_sha1, @options[:extended_sha1], placeholder: "Input an extended SHA1 syntax", class: "search-input form-control input-mx-250"
+      = button_tag type: 'submit', class: 'btn btn-success' do
+        %i.icon-search
+      .inline.prepend-left-20
+        .checkbox.light
+          = label_tag :filter_ref do
+            = check_box_tag :filter_ref, 1, @options[:filter_ref]
+            %span Begin with the selected commit
+
   .network-graph
     = spinner nil, true