Remove hack for she broken link givelab handbook page

Why is this change being made?

This MR fixes a broken link in GiveLab Volunteer Initiatives handbook page.

Broken link

https://hackforshe.tech/

Context

Last valid Archive's Wayback Machine capture

Jun 17, 2021

https://web.archive.org/web/20210617060415/https://hackforshe.tech/

Proposed solution

According to some research, there has been no news of this hackathon since 2021, and the domain is no longer valid. Thus the recommended approach is to delete the link.

Author Checklist

• 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
• If the changes affect team members, or warrant an announcement in another way, please consider posting an update in #whats-happening-at-gitlab linking to this MR
  • If this change directly impacts most global team members, it should be a candidate for #company-fyi. Please work with internal communications and check the handbook for examples.

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