Use flexbox instead of bootstrap columns

app/assets/stylesheets/framework/blank.scss

@@ -11,6 +11,12 @@
   }
 }
 
+.blank-state-row {
+  display: flex;
+  flex-wrap: wrap;
+  justify-content: space-around;
+}
+
 .blank-state-welcome {
   text-align: center;
   padding: 20px 0 40px;
@@ -27,6 +33,19 @@
 .blank-state-link {
   display: block;
   color: $gl-text-color;
+  flex: 0 0 100%;
+
+  @media (min-width: $screen-sm-min) {
+    flex: 0 0 48%;
+
+    &:nth-child(odd) {
+      margin-right: 10px;
+    }
+
+    &:nth-child(even) {
+      margin-left: 10px;
+    }
+  }
 
   &:hover {
     background-color: $gray-light;

app/views/dashboard/projects/_blank_state_admin_welcome.html.haml

-.row
-  .col-md-6
+.blank-state-row
   = link_to new_project_path, class: "blank-state-link" do
     .blank-state
       .blank-state-icon
@@ -11,7 +10,6 @@
           Projects are where you store your code, access issues, wiki and other features of GitLab.
 
   - if current_user.can_create_group?
-    .col-md-6
     = link_to admin_root_path, class: "blank-state-link" do
       .blank-state
         .blank-state-icon
@@ -22,7 +20,6 @@
           %p.blank-state-text
             Groups are a great way to organize projects and people.
 
-  .col-md-6
     = link_to new_admin_user_path, class: "blank-state-link" do
       .blank-state
         .blank-state-icon
@@ -33,13 +30,12 @@
           %p.blank-state-text
             Add your team members and others to GitLab.
 
-  .col-md-6
   = link_to admin_root_path, class: "blank-state-link" do
     .blank-state
       .blank-state-icon
         = custom_icon("configure_server", size: 50)
       .blank-state-body
         %h3.blank-state-title
-            Configure your server
+          Configure GitLab
         %p.blank-state-text
           Make adjustments to how your GitLab instance is set up.

app/views/dashboard/projects/_blank_state_welcome.html.haml

 - public_project_count = ProjectsFinder.new(current_user: current_user).execute.count
 
-.row
-  .col-md-6
+.blank-state-row
   - if current_user.can_create_project?
     = link_to new_project_path, class: "blank-state-link" do
       .blank-state
@@ -23,7 +22,6 @@
           If you are added to a project, it will be displayed here.
 
   - if current_user.can_create_group?
-    .col-md-6
     = link_to new_group_path, class: "blank-state-link" do
       .blank-state
         .blank-state-icon
@@ -34,10 +32,7 @@
           %p.blank-state-text
             Groups are the best way to manage projects and members.
 
-  .clearfix
-
   - if public_project_count > 0
-    .col-md-6
     = link_to trending_explore_projects_path, class: "blank-state-link" do
       .blank-state
         .blank-state-icon
@@ -52,7 +47,6 @@
             Public projects are an easy way to allow
             everyone to have read-only access.
 
-  .col-md-6
   = link_to "https://docs.gitlab.com/", class: "blank-state-link" do
     .blank-state
       .blank-state-icon