feat: add template sample to test app

[gsilvapt]

As an example, because there is no theme configured here and this will have no impact in the app. However, another change to the project README is incoming after this change is merged to include a screenshot with an example of the template provided working with django-surface-theme.

[gsilvapt]

In that case, perhaps we should close this one too, @fopina?

[fopina]

I think this one makes sense.

for apitokens to be used/demoed in the testapp, it needs to be made available

testing

[fopina]

I just noticed this is using navigation.html which does not exist in django-admin default template.

I meant that I think this makes perfect sense but applied to the core template 😄

[fopina]

https://github.com/django/django/blob/main/django/contrib/admin/templates/admin/base.html#L46 block userlinks

[fopina]

pushed suggestion (navigation.html to be deleted).

Not the best look adding it after Log out but it was to avoid re-defining the entire block so it's easier to maintain. Options being before view site or after log out 🤷

[gsilvapt]

LGTM, we can keep it like that 👍 testapp is merely for demonstration purposes, so I'm okay with this change. Thus I thought about adding the instructions to add the API Tokens part to the django-surface-theme instead of here - but again, I think it's a fine change anyway 👌