Merge branch 'project-icon' into 'master'

Changing project icon

Closes #14196

See merge request !3268

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

 %ul.nav.nav-sidebar
   = nav_link(path: ['root#index', 'projects#trending', 'projects#starred', 'dashboard/projects#index'], html_options: {class: 'home'}) do
     = link_to dashboard_projects_path, title: 'Projects' do
-      = icon('home fw')
+      = icon('bookmark fw')
       %span
         Projects
   = nav_link(controller: :todos) do

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

 %ul.nav.nav-sidebar
   = nav_link(path: ['dashboard#show', 'root#show', 'projects#trending', 'projects#starred', 'projects#index'], html_options: {class: 'home'}) do
     = link_to explore_root_path, title: 'Projects' do
-      = icon('home fw')
+      = icon('bookmark fw')
       %span
         Projects
   = nav_link(controller: :groups) do

app/views/shared/groups/_group.html.haml

@@ -14,7 +14,7 @@
 
   .stats
     %span
-      = icon('home')
+      = icon('bookmark')
       = number_with_delimiter(group.projects.count)
 
     %span