docs: fix links in README.md for contributing guidelines and script references (#257)

[YousefSedik]

PR Title

fix script reference links

Summary

summary...
updated the reference links for scripts in README.md

Description

updated the reference links for scripts in README.md since they were broken

The changes are as follows:

• updated reference links for scripts

Checks

in the repository

• Made no changes that degrades the functioning of the repository
• Gave each commit a better title (unlike updated README.md)

in the PR

• Followed the format of the pull_request_template
• Made the Pull Request in a small level (for the creator's wellfare)
• Tested the changes you made

Thank You,

Yousef Sedik

[Copilot]

Pull Request Overview

This PR standardizes repository URLs and fixes broken links in the README documentation. The changes correct multiple GitHub repository references that were pointing to incorrect user accounts or branches, ensuring all links consistently point to the main DhanushNehru/Python-Scripts repository.

• Corrected the contributing guidelines reference from CONTRIBUTIONS.md to CONTRIBUTING.md
• Fixed various GitHub repository URLs that were pointing to incorrect user accounts
• Corrected URL path typos and inconsistencies in project links

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