Added Github-handle for Sandra Berjan in design-systems.md

[jenjenkayi]

Fixes #6700

What changes did you make?

• Added github-handle for Sandra Berjan in design-systems.md.

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

• Reducing redundancy in the project file.

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

Adding github-handle to the file. No visual changes to the website.

[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 jenjenkayi-add-github-handle-6700 gh-pages
git pull https://github.com/jenjenkayi/website.git add-github-handle-6700

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

https://github.com/jenjenkayi/website/blob/add-github-handle-6700/CONTRIBUTING.md  

[jphamtv]

Hi @jenjenkayi,

• 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, correctly using spaces instead of tabs to indent

Thanks for your contribution to this issue!

[t-will-gillis]

Hey @jenjenkayi, @patelbansi3009, @taylorbeee, @nssensalo, @ShamaaTabassum as a reminder, while you are waiting for your PRs to be reviewed, please consider reviewing each other’s good first issue PRs and any other PRs you feel comfortable with. Instructions are here for How to Review Pull Requests . You should aim to review two PRs for every PR you submit, and each PR ideally should have two or more reviewers. Thanks!
#6746, #6767, #6768, #6770, #6772

[angela-lee1]

Review ETA: eod 4/29
Availability: from 1:00pm EST 4/29

[angela-lee1]

@jenjenkayi Awesome job!

• you have linked the correct issue, your branch is correct
• a clear description is provided for making the change
• you gave the reason for not providing screenshots

Thank you!

[Thinking-Panda]

@jenjenkayi Thank you for working on this issue!