Added github-handle for Bonnie Wolfe in brigade-organizers-playbook.md

[marioantonini]

Fixes #6153

What changes did you make?

• Added the variable github-handle to Bonnie Wolfe

Why did you make the changes (we will use this info to test)?

• This variable will replace github and picture variables to reduce redundancy

Screenshots of Proposed Changes Of The Website (if any, please do not screen shot code changes)

Adding single variable. No visual changes to the website.

[github-actions]

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From your project repository, check out a new branch and test the changes.

git checkout -b marioantonini-github-handle-bonnie-brigade-organizers-6153 gh-pages
git pull https://github.com/marioantonini/HfLA_website.git github-handle-bonnie-brigade-organizers-6153

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https://github.com/marioantonini/website/blob/github-handle-bonnie-brigade-organizers-6153/CONTRIBUTING.md  

[jphamtv]

Hey @marioantonini - Thanks for working on this issue.

• The pull request is done with the correct branch
• The issue is properly linked
• Your summary of changes is clear
• Your code change is clean and accurate, using spaces instead of tab

Excellent work following pull request best practices!