851 review apps landing page

Closes #851

Meta Issue: https://gitlab.com/gitlab-org/gitlab-ce/issues/20255

• Release: 8.14
• Due date: Nov 18th
• Merge: Nov 22th

URL: /features/review-apps/

Tasks:

• New hero section (the icon should be review icon from the 10 steps and the background screen should be updated)

• Add the collaboration icon that David shared and the below after automatic live preview

• Benefit: One-click to collaborate

• Supporting text: No need to check out a branch or spin up a staging environment. Just send a link and let your team click around.

• Remove the Review Apps overview section. Since the screenshot does not add value and it takes up a decent amount of space.

• Remove the icons, screens, and copy for all of the benefits

• In the place of the benefits, let's use this portion of Dimitrie's image

• The full image was shared here: !3750 (comment 18497551)

• Above the image it should say: "Review Apps transform the way you and your team work. For developers this means you can kick off your feedback process much sooner. Submit a merge request and preview your changes in a live environment. When you push to master, you'll know your changes have gone through CI testing as well as a live review where the team can make sure things actually work.

• For designers, product managers, marketing counterparts, etc., giving feedback just got a lot easier. You won't have to check out branches or spin up a staging environment to preview changes. With Review Apps, you click a link and see the live changes. Hopefully, this means you can give more timely and informed feedback."

• Make size of buttons under Get Started with GitLab Review Apps section be equal.

source/features/review-apps/index.html.haml

@@ -39,8 +39,8 @@ extra_js:
         One-click to Collaborate
       %p
         :markdown
-          Designers and product managers won't need to check out your branch and spin up a staging environment.
-          Send the team a link and let them click around.
+          Designers and product managers won't need to check out your branch and run it in a staging environment.
+          Simply send the team a link and let them click around.
     .feature-item.col-md-10.col-md-push-1
       = icon("review-apps/icon-benefit-3", "feature-icon", { label: "Built for managers and teams" })
       %h3
@@ -82,10 +82,10 @@ extra_js:
             means you can kick off your feedback process much sooner. Submit a merge request
             and preview your changes in a live environment. When you push to master,
             you'll know your changes have gone through CI testing as well as a live review
-            where the team can make sure things actually work.
+            where the team can make sure things work as planned.
             For designers, product managers, marketing counterparts, etc., giving feedback
-            just got a lot easier. You won't have to check out branches or spin up a staging
+            just got a lot easier. You won't have to check out branches or set up a staging
             environment to preview changes. With Review Apps, you click a link and see the live changes.
             Hopefully, this means you can give more timely and informed feedback.
@@ -94,7 +94,7 @@ extra_js:
     %h2.purple-section-title
       Get Started with GitLab Review Apps
     .purple-section-subtitle
-      Read more about the technical aspects of this feature at:
+      Read more about this feature at:
     %a.featured-item-button.white-on-primary.btn-margin-top{ href: "/2016/11/22/introducing-review-apps/" } Blog Post
     %a.featured-item-button.white-on-primary.btn-margin-top{ href: "https://docs.gitlab.com/ce/ci/review_apps/" } Documentation
     %a.featured-item-button.white-on-primary.btn-margin-top{ href: "https://gitlab.com/gitlab-examples/review-apps-nginx" } Example project