Add alt text fields for project cover, background, and thumbnail images.

[zdavis]

[zdavis]

Thank you for taking the time to report this bug. We've reviewed the issue and agree that this should be fixed. We’re adding a “planned” label to indicate that we consider this bug as part of our current work plan.

This was an automated message, but please don't hesitate to reply. Our team watches these issues closely and will respond as soon as we're able to!