[HelpHub] Overhaul Pullquote block documentation

[estelaris]

Article: https://wordpress.org/documentation/article/pullquote-block/

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

Open issues

• [HelpHub] Remove More options screenshot from all block pages #713
• [HelpHub]: Link Control Page #970
• [HelpHub]: Replace "More rich text editing" content with detailed page link in existing articles #986

[github-actions]

Heads up @WordPress/docs-issues-coordinators, we have a new issue open. Time to use 'em labels.

[zzap]

The checklist:

• Review the reference issues and PRs that have been added to the article.
• Make any valid updates from previous releases. If those updates are no longer relevant, close the the issue (NOTE: we can only close issues in the Documentation Issue Tracker, feel free to leave a comment in the Gutenberg repository so a PR can be closed)
• The name of the block should be in regular font and not in italics or bold, if you find any italics or bold, change the font
• Update screenshots with the latest version
• Update videos with the latest version
• Make sure all headings are in sentence case, NOT title case (e.g. "Block toolbar" ✔️ ; "Block Toolbar" ❌ )
• Do NOT hotlink images, take the screenshots and upload then to the documentation site in WordPress
• Update the Change log and add updater's WP.org username and any other contributors that have given feedback/solution even if it wasn't used
• When you are done updating a block article, mark them in the list at [HelpHub] Overhauling blocks articles - READ FIRST #2126

[zzap]

This block has a Background image settings, but we don't have a page for it.