Merge branch 'canary' into master (#711)

* refactor(i18n): simplify the structure of the translation file

* chore: prepare repository for v4.0.0-alpha

* chore: modify go.mod to v4

* refactor: migrate theme configuration to TOML

* fix: exampleSite not using correct theme

* feat: add favicon from assets folder

* refactor: drop linear grandient background feature

remove node-vibrant from dependencies

* feat: use Hugo's code block render hook to implement code copy button

Now it can have i18n support

* refactor: delete color.ts

* refactor: delete Emoji support post from example site

* refactor: drop support for `hidden` field in front matter

* feat: upgrade to PhotoSwipe v5

* chore: bump the required hugo version to 0.100.0

* refactor: remove PhotoSwipe from external.yaml

* fix: extra margin in search result

* fix: incorrect markdown heading level in example site

* refactor: remove some usages of `default` in template

No longer needed thanks to Hugo's configuration merge

* fix: one line codeblock style in firefox

closes https://github.com/CaiJimmy/hugo-theme-stack/issues/564

* feat: add style to new codeblock

* feat: i18n support for codeblock copy text

* fix(menu): jitter when closing menu

It's caused by flexbox gap property, which can't animate

* fix(search): long text overflows under the Search icon

closes https://github.com/CaiJimmy/hugo-theme-stack/issues/515

config/_default/module.toml

@@ -0,0 +1,3 @@
+[hugoVersion]
+extended = true
+min = "0.100.0"

config/_default/params.toml

@@ -0,0 +1,52 @@
+# Theme's default configuration
+mainSections = ["post"]
+featuredImageField = "image"
+rssFullContent = true
+
+[footer]
+
+[dateFormat]
+published = "Jan 02, 2006"
+lastUpdated = "Jan 02, 2006 15:04 MST"
+
+[sidebar]
+compact = false
+
+[sidebar.avatar]
+enabled = true
+local = true
+src = "img/avatar.png"
+
+[article]
+math = false
+toc = true
+readingTime = true
+
+[article.license]
+enabled = false
+default = "Licensed under CC BY-NC-SA 4.0"
+
+[comments]
+enabled = false
+provider = "disqus"
+
+[widgets]
+homepage = []
+page = []
+
+[opengraph.twitter]
+card = "summary_large_image"
+
+[defaultImage.opengraph]
+enabled = false
+local = false
+
+[colorScheme]
+toggle = true
+default = "auto"
+
+[imageProcessing.cover]
+enabled = true
+
+[imageProcessing.content]
+enabled = true