[HelpHub] Overhaul Author block #2310

Article: https://wordpress.org/documentation/article/post-author-block/

Review full article, follow steps from the [HelpHub] Overhauling blocks articles - READ FIRST
#2126

Open issues

• [HelpHub] Broken and missing screenshots (mostly block pages) #1649
• [7.1 ? HelpHub] Post Author block deprecation #1656
• [6.7 HelpHub]: Post Author block #1775
• [HelpHub] Theme blocks Documentation Page has many Broken Images issues #2080
• Change title to Author block without altering the url