Update link to sample code in gutenberg-examples

[welenofsky]

What?

This PR fixes the "finished app" link on this page to point to the updated location of the gutenberg-examples repository sample code. This link changed due to this refactor WordPress/gutenberg-examples@33348e9 and PR: WordPress/gutenberg-examples#195

Why?

The link was changed when the files were reorganized in the example code repository.

How?

I found the example code repository on github and noticed that the directory had changed. I copied the link to this directory and compared it with the link on the site and noticed the difference/created this PR

Testing Instructions

Try to click the new link and verify that it functions correctly and links to the correct location on github.

[github-actions]

👋 Thanks for your first Pull Request and for helping build the future of Gutenberg and WordPress, @welenofsky! In case you missed it, we'd love to have you join us in our Slack community, where we hold regularly weekly meetings open to anyone to coordinate with each other.

If you want to learn more about WordPress development in general, check out the Core Handbook full of helpful information.

[fabiankaegy]

Thanks for this fix :)

[github-actions]

Congratulations on your first merged pull request, @welenofsky! We'd like to credit you for your contribution in the post announcing the next WordPress release, but we can't find a WordPress.org profile associated with your GitHub account. When you have a moment, visit the following URL and click "link your GitHub account" under "GitHub Username" to link your accounts:

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Kudos!