Migrate public layouts to new design

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

app/views/layouts/explore.html.haml

@@ -2,7 +2,7 @@
 !!! 5
 %html{ lang: "en"}
   = render "layouts/head", title: page_title
-  %body{class: "#{app_theme} application", :'data-page' => body_data_page}
+  %body{class: "#{app_theme} sidenav application", :'data-page' => body_data_page}
     = render "layouts/broadcast"
     - if current_user
       = render "layouts/head_panel", title: page_title

app/views/layouts/nav/_group.html.haml

@@ -3,6 +3,7 @@
     = link_to group_path(@group), title: "Home" do
       %i.fa.fa-dashboard
       Activity
+  - if current_user
     = nav_link(controller: [:group, :milestones]) do
       = link_to group_milestones_path(@group) do
         %i.fa.fa-clock-o

app/views/layouts/public_group.html.haml

 !!! 5
 %html{ lang: "en"}
   = render "layouts/head", title: group_head_title
-  %body{class: "#{app_theme} application", :'data-page' => body_data_page}
+  %body{class: "#{app_theme} sidenav application", :'data-page' => body_data_page}
     = render "layouts/broadcast"
     = render "layouts/public_head_panel", title: "group: #{@group.name}"
-    %nav.main-nav.navbar-collapse.collapse
-      .container= render 'layouts/nav/group'
-    .container
-      .content= yield
+    .page-with-sidebar
+      .sidebar-wrapper
+        = render 'layouts/nav/group'
+      .content-wrapper
+        .container-fluid
+          .content
+            = render "layouts/flash"
+            .clearfix
+              = yield
+    = yield :embedded_scripts

app/views/layouts/public_projects.html.haml

 !!! 5
 %html{ lang: "en"}
   = render "layouts/head", title: @project.name_with_namespace
-  %body{class: "#{app_theme} application", :'data-page' => body_data_page}
+  %body{class: "#{app_theme} sidenav application", :'data-page' => body_data_page}
     = render "layouts/broadcast"
     = render "layouts/public_head_panel", title: project_title(@project)
-    %nav.main-nav.navbar-collapse.collapse
-      .container= render 'layouts/nav/project'
-    .container
-      .content= yield
+    .page-with-sidebar
+      .sidebar-wrapper
+        = render 'layouts/nav/project'
+      .content-wrapper
+        .container-fluid
+          .content
+            = render "layouts/flash"
+            = yield
+    = yield :embedded_scripts

app/views/layouts/public_users.html.haml

 !!! 5
 %html{ lang: "en"}
   = render "layouts/head", title: @title
-  %body{class: "#{app_theme} application", :'data-page' => body_data_page}
+  %body{class: "#{app_theme} sidenav application", :'data-page' => body_data_page}
     = render "layouts/broadcast"
     = render "layouts/public_head_panel", title: @title
     .container.navless-container