message: docs(theme): add description about adding excerpt
diff: @@ -14,12 +14,6 @@ tag:
  The topic provides you with a list of all articles under the path `/article/` by default.
  -## Auto Excerpt
  -
  -By default, the theme will only display the excerpt or description you specify in the article list.
  -
  -If you want the theme to automatically extract excerpts, set `plugins.blog.autoExcerpt: true` in theme options.
  -
  ## Article
  All articles will be added to the article list by default and rendered under the path `/article/`.
  @@ -37,6 +31,18 @@ For sticky articles, you can set `sticky` with a number to set their order. Arti
  :::
  +## Excerpt
  +
  +If you want to add a excerpt for article, you can use `<!-- more-->` comment to mark it. All contents before the comment will be regarded as excerpt. Also, you can specific it with `excerpt` in frontmatter with a HTML string.
  +
  +::: info Auto Excerpt
  +
  +By default, the theme will only display the excerpt or description you specify in the article list.
  +
  +If you want the theme to automatically extract excerpts, set `plugins.blog.autoExcerpt: true` in theme options.
  +
  +:::
  +
  ## Star Articles
  You can star an article by setting `star` to `true` in frontmatter. After staring, users can view these articles on the `/star/` page.
  