Taking inspiration from the Bolt playbook to expand on ideas already in the Gitlab Handbook

Why is this change being made?

The Bolt playbook has some guidelines that work well with the GitLab handbook. Taking inspiration from the Bolt playbook, this MR is adding the following to the Gitlab Handbook:

1. Adding about showing up to do our best work
2. Actively learning from our mistakes
3. Freedom and responsibility to do their projects and see through to the end
4. adopting a founder mentality to solve problems and what it means to own a task
5. highlighting the benefits of seeking unique backgrounds
6. Making the best decisions for the company and a conscious culture

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
  • Copy/paste the Slack conversation to document it for later, or upload screenshots. Verify that no confidential data is added.
• Assign reviewers for this change to the correct DRI(s)
  • 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 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 is a change that directly impacts the majority of 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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