fork button fixed

[wthrajat]

the fork image wasn't properly rendering in Firefox and chromium based browsers, so it is replaced with "Fork" button

🛠️ Fixes Issue

👨‍💻 Changes proposed

✔️ Check List (Check all the applicable boxes)

• [x] My code follows the code style of this project.
• [x] This PR does not contain plagiarized content.
• [x] The title of my pull request is a short description of the requested changes.

📄 Note to reviewers

Contribution.md fork button fixed :)

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[wthrajat]

do let me know if instead of the button you want to add an image like before