New layout for snippets added

app/views/layouts/snippets.html.haml

+!!! 5
+%html{ lang: "en"}
+  = render "layouts/head", title: "Snipepts"
+  %body{class: "#{app_theme} application"}
+    = render "layouts/head_panel", title: "Snippets"
+    = render "layouts/flash"
+    .container
+      %ul.main_menu
+        = nav_link(path: 'dashboard#show', html_options: {class: 'home'}) do
+          = link_to root_path, title: "Back to dashboard" do
+            %i.icon-arrow-left
+        = nav_link(path: 'snippet#new') do
+          = link_to new_snippet_path do
+            New snippet
+        = nav_link(path: 'snippets#user_index') do
+          = link_to user_snippets_path(@current_user) do
+            My snippets
+        = nav_link(path: 'snippets#index') do
+          = link_to snippets_path do
+            Discover snippets
+        = nav_link(path: 'search#show') do
+          = link_to "Search", search_path
+
+      .content= yield