[ENHANCE] Require sign-in before viewing registration form (🟠 AWAITING DESIGNS)

[lachlanglen]

Title

Require sign-in before viewing registration form

Summary

The "Create New Project" should display a message prompting me to log in if I am not logged in, and the form should not display in this case.

Motivation

[More detailed explanation of the motivation for the enhancement, including any benefits it would provide]

Description

[Detailed description of the enhancement, including how it would work and any design considerations]

Alternatives

[Discussion of any alternative solutions that were considered and why the proposed solution is preferred]

Risks

[Identification and mitigation of any potential risks associated with the enhancement]

Acceptance Criteria

[List of criteria that must be met for the enhancement to be considered accepted]

Additional Information

[Any other relevant information, such as links to related issues or pull requests]