Feature: Duration Configuration to _config.yml and Update motion.js

[Zerohertz]

PR Checklist

• 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 (e.g. formatting, linting).
• Refactoring (no changes to functionality and APIs).
• Documentation.
• Translation.
• Other... Please describe:

What is the current behavior?

Adjusting the duration required direct modification within source/js/motion.js.

What is the new behavior?

• Added motion.duration configuration in _config.yml to manage the motion duration setting conveniently.
• Updated source/js/motion.js to retrieve the duration value from CONFIG.motion.duration, defaulting to 200 if not set.

How to use?

In NexT _config.yml:

motion:
...
  duration: 200
...

duration-120.mov

duration-200.mov

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[github-actions]

This pull request contains changes to the configuration file. Please make sure the documentation in NexT website is changed or added.
Please edit relevant source files here: https://github.com/next-theme/theme-next-docs/tree/master/source/docs and create a pull request with the changes here: https://github.com/next-theme/theme-next-docs/pulls

[coveralls]

Pull Request Test Coverage Report for Build 11828990925

Details

• 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 97.446%

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Totals
Change from base Build 11756704583:	0.0%
Covered Lines:	400
Relevant Lines:	405

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💛 - Coveralls

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