feat: privacy sheet updates

[tm-ruxandra]

Description

Replace old ad-hoc privacy info modal implementation with one built on the standard OverlaySheet component. Update sheet content to match specification in design documents. Do minor cleanup in related areas.

Checklist

• [x] Corresponding issue has been opened

Related Issues

755

Verification steps

Press the info button in the following areas and verify that the sheet works as expected:

• Create project form
• Create site form
• Project input screen
• Site dashboard screen

[ssfrancis]

Yes, I think we should refer to the Tech Matters Privacy Policy for now, and we’re working to update it ASAP.

Thanks, Steve