Fix and Added the "Scroll Down Progress Bar"

[MastanSayyad]

Hey @apu52

• Issue fixes [Bug]: Scroll Down Progress Bar Not Working Properly #1069

• I have fixed the working of scroll down progress bar

• Additionally I have added the bar in all missing pages to maintain consistency across the website
  - About us
  - Contact
  - Contibutor

Video (mandatory)

25.07.2024_02.22.42_REC.mp4

Checklist:

• I have mentioned the issue number in my Pull Request.
• I have commented my code, particularly in hard-to-understand areas
• I have created a helpful and easy to understand README.md
• I have gone through the contributing.md file before contributing

Are you contributing under any Open-source programme?

• I'm a GSSOC'24 contributor
• I'm a SSOC'24 contributor

[github-actions]

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[apu52]

@MastanSayyad good work