Refactor several components in _config.yml

[stevenjoezhang]

Breaking change

Deleted:
avatar.opacity
codeblock.border_radius

Renamed:
highlight_theme -> codeblock.highlight_theme
custom_logo.image -> custom_logo
pace_theme -> pace.theme

avatar:
-  opacity: 1

-highlight_theme: normal
codeblock:
+  highlight_theme: normal
-  border_radius:

-custom_logo:
-  enable: false
-  image: #/uploads/custom-logo.jpg
+custom_logo: #/uploads/custom-logo.jpg

-pace: false
-pace_theme: pace-theme-minimal
+pace:
+  enable: false
+  theme: minimal

In _config.yml, avatar.opacity and codeblock.border_radius only changes the style of one particular class of elements.
As a result of #868, creating custom css is unprecedented in simplicity. These options should be removed and users can use custom css instead.
Besides, codeblock.border_radius should follow codeblock.copy_button.style

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: #299

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.

[sli1989]

1. how to set codeblock.border_radius according to highlight.styl?
2. about avatar.opacity, this also should be reset?
   

   hexo-theme-next/source/css/_common/components/sidebar/sidebar-author.styl

   Line 8 in 57289bc

   opacity: hexo-config('avatar.opacity') is a 'unit' ? hexo-config('avatar.opacity') : 1;

[stevenjoezhang]

About the second question, it has already been reset. You can check the master branch.

[sli1989]

oh, thanks. but how to custom these two css for xiaobai. 😢

[stevenjoezhang]

Add this to _data/styles.styl:

.site-author-image {
 opacity: 0.7;
}

[ivan-nginx]

Add this to _data/styles.styl:

.site-author-image {
 opacity: 0.7;
}

Answers like that must be documented in site for around excess questions.

[1v9]

@ivan-nginx FAQ?

[stevenjoezhang]

See also theme-next/theme-next.org#36

[ivan-nginx]

@ivan-nginx FAQ?

Yep.