add github-handle Aleiya Gafar in brigade-organizers-playbook.md issue -#6154

[Jperparas]

Fixes #6154

What changes did you make?

• added github-handle variable to Aleiya Gafar

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

• reduce redundancy

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

-no visual changes

[github-actions]

Want to review this pull request? Take a look at this documentation for a step by step guide!

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

git checkout -b Jperparas-add-github-handle-aleiya-gafar-6154 gh-pages
git pull https://github.com/Jperparas/website.git add-github-handle-aleiya-gafar-6154

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Note that CONTRIBUTING.md cannot previewed locally; rather it should be previewed at this URL:

https://github.com/Jperparas/website/blob/add-github-handle-aleiya-gafar-6154/CONTRIBUTING.md  

[colin-macrae]

Availability: 3/12-14
ETA: 3/14

[angela-lee1]

Review ETA: EOD 3/14
Availability: 3/13 3/14

[angela-lee1]

@Jperparas Great job!

• you linked the correct issue, your branch is correct
• a clear description is provided for the reason for making the change
• you gave the reason for not providing screenshots
• the appearance of the project webpage is unchanged at all screen sizes
  Thank you!

[colin-macrae]

@Jperparas , great job.

• The branch is going into the correct branch gh-pages. ✅
• The original issue [issue with #number] was properly referenced. ✅
• Per the instructions on the original issue, the specified lines of code were properly updated. ✅