docs(v2): add mr-pdf to resources

[antonygibbs]

Added new option for PDF generation seeing as docusaurus-pdf doesn't work beyond 2.0.0.-alpha73, as establised in bug #29.

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Related PRs

(If this PR adds or changes functionality, please take some time to update the docs at https://github.com/facebook/docusaurus, and link to your PR here.)

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[netlify]

[V2]

Built without sensitive environment variables with commit e7ce636

https://deploy-preview-4818--docusaurus-2.netlify.app

[github-actions]

⚡️ Lighthouse report for the changes in this PR:

Category	Score
🟠 Performance	59
🟢 Accessibility	97
🟢 Best practices	100
🟢 SEO	100
🟢 PWA	95

Lighthouse ran on https://deploy-preview-4818--docusaurus-2.netlify.app/

[slorber]

Thanks, that looks nice

We need you to sign the FB CLA otherwise I technically can't merge this PR

[netlify]

[V1]

Built with commit 59a30ce

https://deploy-preview-4818--docusaurus-1.netlify.app

[antonygibbs]

Sorry, I missed the bit on CLA. I have signed this now.

[facebook-github-bot]

Thank you for signing our Contributor License Agreement. We can now accept your code for this (and any) Facebook open source project. Thanks!

[lex111]

@kohheepeace maybe we should remove the link to docusaurus-pdf at all, if there is better alternative as mr-pdf?

[kohheepeace]

@lex111 Hi, mr-pdf is not for docusaurus only. So, I think only docusaurus-pdf is listed. But I need to update docusaurus-pdf for v2 beta. The bad things is that I can't say when it will be. So, removing from the list is also ok.

[lex111]

@kohheepeace no worries, I think we only to list mr-pdf, which can work with any version of Docusaurus.

[lex111]

@antonygibbs thanks for update!