This is weird issue of webpack. since ClientComputedMixin was used both in server and client side,
client es module will import this commonJS module, it should work but webpack throw error: 'Uncaught
TypeError: Cannot assign to read only property 'exports' of object '#<Object>''. related issue:
https://github.com/webpack/webpack/issues/4039

1. Strip date from slug,
2. Rename I18n to ClientComputedMixin,
3. Clean internal I18nTemp plugin

This reverts commit 04723be4.

1. Refine ExtendPageDataOption, simplify the implmentation
2. Introduce LayoutDistributor as the unique route layout entry
3. Inject layout components to LayoutDistributor
4. Register layout components located at themedir/layouts
5. Reorganize the default theme's structure

1. Support scope package and shortcut like plugin.
2. Support relative path for 'layout' and 'notFound' option.

1. Move writeTemp utility from @vuepress/shared-utils to @vuepress/core
2. Support for passing temp path from CLI
3. Create writeTemp dynamically

* feat: siteConfig.permalink & frontmatter.permalink

* chore: ensure leading and ending slash

* chore: update comment