Handbook: Change "gitlabber" to "gitlab team member" on sites/marketing/source/company/strategy/index.html.md

Misused term (or terms)

• Gitlabber

Alternatives

• GitLab team member

Reason why

Gitlabber is a commonly misused term: https://about.gitlab.com/handbook/communication/top-misused-terms/

Author checklist

• Named the MR appropriately
• Updated data/communication/misused_terms.yml properly
• Reviewed how it renders on the Top Misused Terms page
• Submit for review

Review process

• Assign to any GitLab team member for initial review and approval.
• Assign to the Diversity and Inclusion Manager (@cwilliams3) for final review and merge.