[HelpHub] Overhaul First steps with WordPress (Block Editor) article

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Article: https://wordpress.org/documentation/article/first-steps-with-wordpress-block-editor/

Review full article, follow steps from the [HelpHub] Overhauling articles in the Technical guides category - READ FIRST #2181

Open issues

• [HelpHub] Feedback on First steps with WordPress (Block Editor) #1711
• [HelpHub] Section Alignment issue article page #1625