Update Gallery with Wavelet Cookbook

[cyschneck]

Root Repository Name

wavelet-cookbook

Did you check if your contribution would be better suited as an addition to an existing Cookbook, before generating a new one?

yes

Additional comments

Completed Steps to Publish

[github-actions]

Thank you for your contribution 🎉, @cyschneck!

We're currently running validation checks to make sure the contents of your submission are okay. An update will be posted here shortly once the validation checks are passing.

[github-actions]

@cyschneck, your submission looks great! We've created a pull request on your behalf using the information you provided.

The pull request can be accessed from this url: https://github.com/ProjectPythia/cookbook-gallery/pull/217.