Load velocity only if motion is enabled

[stevenjoezhang]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines.
• Tests for the changes was maked (for bug fixes / features).
  • Muse | Mist have been tested.
  • Pisces | Gemini have been tested.
• Docs in NexT website have been added / updated (for features).

PR Type

What kind of change does this PR introduce?

• Bugfix.
• Feature.
• Code style update (formatting, local variables).
• Refactoring (no functional changes, no api changes).
• Build related changes.
• CI related changes.
• Documentation content changes.
• Other... Please describe:

What is the current behavior?

Issue resolved: #113

iissnan/hexo-theme-next#803

Sidebar could be placed in the left/right for all schemes.
Sidebar could be displayed without animation.

What is the new behavior?

• Screenshots with this changes: N/A
• Link to demo site with this changes: N/A

How to use?

In NexT _config.yml:

...

Does this PR introduce a breaking change?

• Yes.
• No.

{{ author.text }} will be ignored

[1v9]

hexo-theme-next/layout/_scripts/commons.swig

Lines 1 to 10 in 89b8663

	{%
	set js_commons = [
	'utils.js',
	'motion.js'
	]
	%}
	{% for common in js_commons %}
	<script src="{{ url_for(theme.js) }}/{{ common }}?v={{ version }}"></script>
	{% endfor %}

Yes, countless velocity... like sidebarToggleMotion

[1v9]

I have tested several times, now we can say goodbye to velocity when motion is disable.

[stevenjoezhang]

Next step: say goodbye to jQuery 😂

[stevenjoezhang]

I'll merge this PR first. For the issues it may cause (about motion / sidebar), I will solve them in the future when I refactor sidebar-dimmer