Feature: display sidebar on mobile for Pisces and Gemini, fix issue #708

[triccsr]

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?

Sidebar does not display on tablet or mobile for scheme Pisces and Gemini.

Issue resolved: #708

What is the new behavior?

new option on_mobile: Only for Pisces and Gemini. If enabled, a sidebar toggle button will appear on mobile website, just like the way that scheme Muse&Mist work.

new option button_reverse: For all schemes. If enabled, the position of back2top button and sidebar toggle button will be reversed (left to right, right to left).

• Link to demo site with this changes: https://triccsr.github.io/ (on_mobile is enabled, but button_reverse is disabled)
• Screenshots with this changes:
  

How to use?

In NexT _config.yml:

sidebar:
  # Sidebar display on mobile, default value is false (only for Pisces | Gemini)
  on_mobile: true
  # Reverse position of sidebar toggle and back2top button (left to right, right to left), default value is false
  button_reverse: true

[welcome]

Thanks so much for opening your first PR here!

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All committers have signed the CLA.

[coveralls]

Pull Request Test Coverage Report for Build 8849477699

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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 97.421%

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Totals
Change from base Build 8716367640:	0.0%
Covered Lines:	395
Relevant Lines:	400

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💛 - Coveralls

[stevenjoezhang]

Thanks for your contribution! I'm quite busy right now, I'll review & merge it later! 🚀

[stevenjoezhang]

Thank you for your patience. I will conduct the test & merge as soon as possible! This feature is very nice and important to the theme~

[triccsr]

Thank you for your patience. I will conduct the test & merge as soon as possible! This feature is very nice and important to the theme~

My pleasure!

[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

[stevenjoezhang]

I have made some changes, and I think it is now ready to be merged. If there are any issues, please let me know.

[welcome]

Congrats on merging your first pull request here! 🎉 How awesome!