feat: add demo mode to instance

[djaiss]

This PR adds a demo mode to OfficeLife.

The demo mode is made for an instance that is supposed to showcase how OfficeLife behaves with real data.

To enable the demo mode, we need to edit a new .env variable called DEMO_MODE. By default, the demo mode is set to false.

Once the demo mode is enabled:

• a new banner will be added to the header of the application, indicating that the instance runs on the demo mode,

• some features are deactivated: importing users, adding new users, deleting the account and deleting employees. For those features, we display the following message:

• we also add a new .env variable ENABLE_SIGNUPS that activates or deactivates the Signup form on the instance.
• when we are in the demo mode, we also indicate the email and the password that we need to use in order to authenticate to the demo instance.

[djaiss]

@asbiin could you review?

[djaiss]

@asbiin wait, don't review now. Still have changes to do.

[djaiss]

@asbiin that should be good.

[asbiin]

Nice feature!
You deactivated some actions for demo mode at View level. But you also have to check it in the Controller, or someone would be able to forge a request and run it!

[djaiss]

You deactivated some actions for demo mode at View level. But you also have to check it in the Controller, or someone would be able to forge a request and run it!

You are right. I'll add those changes.

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities
0 Security Hotspots
2 Code Smells

100.0% Coverage
0.0% Duplication

[github-actions]

🎉 This PR is included in version 0.1.0-alpha.10 🎉

The release is available on:

• GitHub release
• v0.1.0-alpha.10

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