Make "introduced in" notes look better

The problem

Our "Introduced in GitLab X.Y" notes are too evident, but they are important to maintain.

Proposal

• Identify all > [Introduced](link) in notes with a RegEx script
• Add class .introduced-in to blockquote
• Style blockquote.introduced-in to make it less evident

Style

blockquote.introduced-in {
  border-width: 0;
  margin: 5px 0;
  padding: 10px 0;
  font-size: 15px;
  text-align: right;

  p {
    font-style: italic;
    font-size: small;
  }
}

BEFORE	AFTER