Add github-handle for Eli Marietta in design-systems.md

[codyyjxn]

Fixes #7288

What changes did you make?

• I updated the _projects/design-systems.md file by inserting a new key, 'github-handle,' directly beneath the name: Eli Marietta

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

• I made this change to streamline the project file by introducing a 'github-handle' key, which replaces the need for separate 'github' and 'picture' entries.

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

• No screenshots since adding a variable did not create any new visual change

[github-actions]

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

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

git checkout -b codyyjxn-add-github-handle-7288 gh-pages
git pull https://github.com/codyyjxn/website.git add-github-handle-7288

[codyyjxn]

@kgold2018 @MicahBear Hi. Would you please review my pr ?

[kgold2018]

Hi @codyyjxn, the changes look good, but please check off all the relevant action items on the original issue. Thank you!

[codyyjxn]

@MicahBear Hi please review my pr.

[bexux]

Changes look good. PR description is accurate and concise. Great job!

[t-will-gillis]

Hey @codyyjxn For future reference, you do not need to assign yourself to your own PRs