Salesforce TrailheaDX blog announcing new Trailhead and promotion for SFDC users

What is this blog post about?

Highlighted Topics

1. GitLab's presence at TDX'19
2. GitLab Product integrations:

• SSO for GitLab.com with Salesforce ID
• Project Templates for Salesforce development
• CI template for CI/CD for Salesforce Development Platform

1. Value for Salesforce developers to use GitLab
2. Gitlab.com promotion details for Salesforce customers

What are the relevant issue numbers?

Closes https://gitlab.com/gitlab-com/www-gitlab-com/issues/4422

Checklist

• Link to issue added, and set to close when this MR is merged
• Due date and milestone added for the desired publish date - NEED PUBLISHED 2019-05-30
• If time sensitive
  • Added ~"priority" label
  • Mentioned @rebecca to give her a heads up ASAP
• Reviewed by team member
• Reviewed by content team