Add a demo app to give another approach of "getting started" to discover Tempest's functionalities

[gturpin-dev]

Description

As discussed on discord, it could be nice to have a "demo app" for Tempest docs.

Similar to https://github.com/symfony/demo or https://inertiajs.com/demo-application this app could show how to build a basic app using Tempest's best practices It can be a different approach to a "getting started" to help people discover Tempest's functionalities

Idk if this could be a separate app specifically built for this demo or just a link to Tempest's website code source ( like the stats using event sourcing ) or even links to @brendt YouTube lives where something is built with Tempest 🤷‍♂️

Benefits

Reduce the learning curve of Tempest 🎉

[github-actions[bot]]

This issue is stale because it has been open for 30 days with no activity.

[github-actions[bot]]

This issue was closed because it has been inactive for 1 day since being marked as stale.

[brendt]

Let's tackle this one by adding some more usable classes in tempest/app. I'm thinking: a console command, a controller with a view, a model and a migration, a view component, maybe something else?

This part is important to do before 1.0. Afterwards, we can also make a real "demo app", but that's not required for 1.0. Also, we could already refer to the docs for a real Tempest app

[gturpin-dev]

I think this is good Maybe show how to use events and mailing ?

[brendt]

Duplicate of #1665