Added github-handle for Emerson Castaneda in civic-tech-index.md

[taylorbeee]

Fixes #6175

What changes did you make?

• Added an empty github-handle variable under Emerson Castaneda's name variable.

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

• It will be eventually used to replace the github and picture variables, reducing redundancy in the project file.

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

• Added an empty variable in the code. 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 taylorbeee-add-github-handle-Emerson-6175 gh-pages
git pull https://github.com/taylorbeee/website.git add-github-handle-Emerson-6175

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https://github.com/taylorbeee/website/blob/add-github-handle-Emerson-6175/CONTRIBUTING.md  

[freaky4wrld]

Hey @taylorbeee thanks for taking up the issue, branches looks good, the issue is linked correctly and changes done correctly. Testing on local machine shows desired result.

PR approved!!

[jphamtv]

Hey @taylorbeee - Thanks for working on this issue!

Your summary of changes is clear, and your code correctly uses spaces instead of tabs.

Great job!