Add Create Block Theme to Tools page in Theme Handbook

[justintadlock]

Suggested via Slack by @bacoords.

Issue Description

The Create Block Theme needs to be mentioned under the Tools section in the Theme Handbook. https://wordpress.org/plugins/create-block-theme/

URL of the Page with the Issue

https://developer.wordpress.org/themes/getting-started/tools-and-setup

Section of Page with the issue

https://developer.wordpress.org/themes/getting-started/tools-and-setup/#other-development-tools

Why is this a problem?

It's a core tool but isn't mentioned.

Suggested Fix

Add a link to the plugin page for Create Block Theme with a short description to bring more awareness to the tool/project.

[github-actions]

Heads up @kafleg @carolinan @TeBenachi - the "themes" label was applied to this issue.

[github-actions]

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