Added vision back in to the Handbook

Why is this change being made?

Following agreement (see #105 (comment 1577742438)) with @laurenbarker from buyer experience I've recreated the vision page in the new handbook site. As the original page was deleted and I'm unable to get the history for this page and do our normal migration process.

I've also added a new include to retain the sales links at the bottom of the page to point back to the free trial option and about.gitlab.com/sales. I've added this to vision, cadence, history, mission, purpose, stewardship, strategy and yearlies as well as the contents page for the handbook (/handbook) as a group of pages which I think might benefit from this.

Author and Reviewer Checklist

Please verify the check list and ensure to tick them off before the MR is merged.

• Provided a concise title for this Merge Request (MR)
• Added a description to this MR explaining the reasons for the proposed change, per say why, not just what
  • Copy/paste the Slack conversation to document it for later, or upload screenshots. Verify that no confidential data is added, and the content is SAFE
• Assign reviewers for this MR to the correct Directly Responsible Individual/s (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 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
  • The when to get approval handbook section explains the workflow in more detail
• For transparency, share this MR with the audience that will be impacted.
  • Team: For changes that affect your direct team, share in your group Slack channel
  • Department: If the update affects your department, share the MR in your department Slack channel
  • Company: If the update affects all (or the majority of) GitLab team members, post an update in #whats-happening-at-gitlab linking to this MR
    • For high-priority company-wide announcements work with the internal communications team to post the update in #company-fyi and align on a plan to circulate in additional channels like the "While You Were Iterating" Newsletter

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