Remove the 👋 emoji from the Block Editor Handbook

[ndiego]

While emojis are fun, I do not think this specific emoji is needed, and it's also negatively impacting the Open Graph Meta for the page, see WordPress/wporg-developer#478.

Before	After

[fabiankaegy]

I think the emoji gives it a nice approachable charm and am sad to see it go. But can see your reasons and it makes sense to me 👍

[github-actions]

Flaky tests detected in 34a0102.
Some tests passed with failed attempts. The failures may not be related to this commit but are still reported for visibility. See the documentation for more information.

🔍 Workflow run URL: https://github.com/WordPress/gutenberg/actions/runs/7588075542
📝 Reported issues:

• [Flaky Test] the event listener is removed when the element is removed #57983 in /test/e2e/specs/interactivity/directive-on-document.spec.ts