3716 add data usage statement

[aranas]

Summary

Adding a User Awareness Statement about our use of Google Analytics to the Afterword

Fixes #3716

List of changes proposed in this PR (pull-request)

• added a new markdown file with the statement
• updated toc

What should a reviewer concentrate their feedback on?

• Is there any information missing from the statement?
• Are there better links to indicate in what ways Google Analytics might be problematic?

Acknowledging contributors

• All contributors to this pull request are already named in the table of contributors in the README file.
• The following people should be added to the table of contributors in the README file:

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[RichardJActon]

Looks good in the preview, glad to hear the plan is to ditch google analytics, the sooner the better.

[acocac]

@aranas - this is a great content that hopefully will lead us to a more GDPR-compliant service to track the web analytics of TTW book. I've made some minor suggestions.

[acocac]

Suggested change

	Data on search terms people use to find the website can help us understand readers' needs and preferences.
	Data on search terms people use to find the website can help us understand readers' needs and preferences.

[aleesteele]

Thank you for making this important contribution @aranas! Just wanted to flag that we also use the following website for our analytics on our github repository: https://cauldron.io/. I don't know if this is something we want to add here as well? :)

[aranas]

Thank you for making this important contribution @aranas! Just wanted to flag that we also use the following website for our analytics on our github repository: https://cauldron.io/. I don't know if this is something we want to add here as well? :)

Yes, I think it would be nice for transparency's sake. I have added this!

[malvikasharan]

Thank you Sophie. This is such an important addition. ❤️

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