Add iteration to engineering page

Why is this change being made?

This is a follow up item from the our EVPE Office Hours to add an Iteration section to the front page of Engineering

This MR moves the Iteration Section from the Product Intelligence Development page to the GitLab Engineering page. I've also made minor changes to the wording to better describe how we should iterate.

Note that I did not combine this with the existing Engineering Workflow - Iteration as I was concerned it may make this section too long. I've instead linked out to it for now.

Author Checklist

• Provided a concise title for the MR
• Added a description to this MR explaining the reasons for the proposed change, per say-why-not-just-what
• Assign this change to the correct DRI
  • If the DRI for the page/s being updated isn’t immediately clear, then assign it to one of the people listed in the "Maintained by" section in on the page being edited.
  • If your manager does not have merge rights, please ask someone to merge it AFTER it has been approved by your manager in #mr-buddies.
  • If the changes relate to any part of the project other than updates to content and/or data files please make sure to ping @gl-static-site-editor in a comment for a review and merge. For example changes to .gitlab-ci.yml, JavaScript/CSS/Ruby code or the layout files. (this requirement has been removed pending identification of a new DRI for the handbook)