message: feat(theme): support frontmatter.excerpt
diff: @@ -164,7 +164,8 @@ export const extendsPage = (
  const excerpt = isEncrypted
  ? ""
  - : page.excerpt ||
  + : frontmatter.excerpt ||
  + page.excerpt ||
  frontmatter.description ||
  (typeof plugins.blog === "object" && plugins.blog.autoExcerpt
  ? frontmatter.summary || ""
  