Add the ability to mark a project as a "stealth" project

[SherRao]

Description

We want users to keep details of their projects private if they are a stealth project.

In the first section in the project creation form, let's add a new Yes/No or checkmark question that asks the user if they want to identify this as a stealth project, while also explaining to the user what that means and what information will remain private.

Some routes we can go down:

• Adding a new global flag for every question called "showWhenStealth", and letting the user know exactly what questions will stay private when stealth mode is on. This would mean we would pre-define what questions are private and what aren't.
• Allowing the user to choose which questions they want to hide and which they want to keep public, through some sort of checkbox.

Checklist

Before submitting this ticket, make sure this ticket:

• Is labelled properly - if this is a refactor, add the label!
• Has the SPUR project assigned to it.
• Has an assigned milestone.

And lastly:

• Once someone picks up this ticket, make sure to assign it.