message: docs: update icon style
diff: .theme-hope-content a {
  - &[href*="github.com/"],
  - &[href*=".vuejs.org/"],
  + &[href*="github.com"],
  + &[href*=".vuejs.org"],
  &[href*="/v2/blog/"],
  &[href*="/v2/comment/"],
  &[href*="/v2/components/"],
  }
  }
  - &[href*="github.com/"]::before {
  + &[href*="github.com"]::before {
  content: "\e653";
  }
  - &[href*=".vuejs.org/"]::before {
  + &[href*=".vuejs.org"]::before {
  content: "\f25f";
  }
  