Add Astro user management implementation

[alexwhitmore]

Improve documentation

Link

In the “Web App Tutorials” section.

Describe the improvement

It would be awesome to add an Astro implementation to the web app tutorials, providing one more user management web app example.

Additional context

If there’s interest in adding this, I would love to take it on!

[charislam]

Would be great to have Astro! Feel free to get started on this if you're interested!