Upgrade to fancybox 5

[stevenjoezhang]

Breaking

jQuery is now completely removed.

PR Checklist

• The commit message follows guidelines for NexT.
• The changes have been tested (for bug fixes / features).
• Docs in NexT website have been added / updated (for features).

PR Type

• Bugfix.
• Feature.
• Improvement.
• Code style update (formatting, linting).
• Refactoring (no functional changes).
• Documentation.
• Translation.
• Other... Please describe:

What is the current behavior?

Issue resolved: theme-next/hexo-theme-next#1525

What is the new behavior?

• Link to demo site with this changes:
• Screenshots with this changes:

How to use?

In NexT _config.yml:

[coveralls]

Pull Request Test Coverage Report for Build 5620280793

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 97.416%

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Totals
Change from base Build 5571441244:	0.0%
Covered Lines:	394
Relevant Lines:	399

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💛 - Coveralls