Update README.md for pdf print instructions

[Zacaria]

Hi !

I was trying to print my presentation, but I found out the documentation is outdated.

Thank you for your tool !

[webpro]

Thanks, @Zacaria!

Are you on the latest version of reveal-md? The docs were updated to match the Reveal.js v5 update.

[Zacaria]

Oh, it's true that I didn't see the changelog.

However I just checked again, on my project : https://github.com/Zacaria/apidays-2023 I have version 5.5.2

?view=print gives me this result

?print-pdf gives me this result

Then I believe it's more an issue than a missing documentation

I leave it up to you to close this PR :)

Do you want me to try and fix it ?

[webpro]

Do you want me to try and fix it ?

I would love that! Personally I'm not using the print/PDF functionality at all.

[webpro]

Warning

reveal-md is no longer in active development.

No new features will be added. Pull requests for bug and documentation fixes will be considered. Occasional dependency
upgrades and CVEs might happen.

Thanks for using reveal-md! Please consider these Markdown-based alternatives:

• MkSlides (successor to reveal-md)
• Slidev