Refactor Print Stylesheet and Remove Outdated References

[Harshit457]

This pull request refactors the print.scss file to modernize the print styles, improve readability, and remove reliance on outdated or broken external references. Key updates include:

1. Replaced the $black variable with the standard #000 for consistency.
2. Updated the background property to none for better clarity.
3. Enforced hiding of unnecessary elements using display: none and visibility: hidden.
4. Cleaned up the code for better maintainability by removing redundant declarations.
   These changes ensure the print stylesheet remains functional and easier to maintain without external dependencies.

[mister-roboto]

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[mister-roboto]

@Harshit457 thanks for creating this Pull Request and helping to improve Plone!

TL;DR: Finish pushing changes, pass all other checks, then paste a comment:

@jenkins-plone-org please run jobs

To ensure that these changes do not break other parts of Plone, the Plone test suite matrix needs to pass, but it takes 30-60 min. Other CI checks are usually much faster and the Plone Jenkins resources are limited, so when done pushing changes and all other checks pass either start all Jenkins PR jobs yourself, or simply add the comment above in this PR to start all the jobs automatically.

Happy hacking!