Add stackblitz to this repo

[Baroshem]

Is your feature request related to a problem? Please describe.

We already have a stackblitz demo but it is in a separate repo. Because of that, it can be easily outdated. Let's add this stackblitz as a part of this repository so that it can be easily updated with a new version.

Describe the solution you'd like

Describe alternatives you've considered

Additional context

[Baroshem]

Just like I did here -> https://github.com/Baroshem/nuxt-security/tree/main/stackblitz

https://github.com/Baroshem/nuxt-security/blob/78cecd15263472d619dd9306b71b491139cf2d4b/package.json#L40

https://github.com/Baroshem/nuxt-security/blob/78cecd15263472d619dd9306b71b491139cf2d4b/package.json#L60