feat: separate server related code

[mathiasayivor]

Fixes Issue

My PR closes #579

👨‍💻 Changes proposed(What did you do ?)

• Moved server related code to src/server directory
• Moved shared code to src/shared directory

✔️ 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 and description of the PR is clear and explains the approach.

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