Download, clean and optimize 5 page of a bootstrap website

I need to:
- Download 5 page of a website
- Fix url (from absolute to relative)
- Rearrange file in subdirectory with common pattern (assets, assets/images, assets/js, etc)
- Convert from boostrap 4 to bootstrap 5
- Remove analytics, facebook and all other plugin not necessary
- Optimize and validate code with w3c and google test
- No JS error on console!

The website have to be responsive with perfect UX experience on mobile, without any error with:
https://validator.w3.org
https://jigsaw.w3.org/css-validator/

And must pass these test:
https://search.google.com/test/mobile-friendly
https://developers.google.com/speed/pagespeed/insights/