Docs: Update tier badges to reflect Dedicated and GitLab.com

In this issue we had a lengthy discussion about how to update our existing badges to account for the separation between the GitLab.com, GitLab Dedicated, and self-managed offerings.

We have since re-done our tier badges. That work is in progress and should be complete by Friday, Jan 26. Details of the change are here.

After this work is complete, we will work to tag pages as either .com or Dedicated.

Which topics to update

In this spreadsheet I've started a list of pages to review. If a page has the SaaS tier badge, we'll need to review if the page also applies to Dedicated. Yellow means I'm not sure.

This spreadsheet needs assistance from someone on the product team.

https://docs.google.com/spreadsheets/d/138WQy98AM9UJLk0KmZ6oJjyDwyvMeyiQMoh40FpYTkk/edit?usp=sharing