Tell CK Users to Grab their Keyboard

[brandonjackson]

• replaces selected-challenge modal in offline mode
• tells users to grab their keyboard

Before: Given you are looking at the challenge list view When you try to start challenge X by clicking on its cover photo Then a modal showing the challenge X cover photo appears

Now: Given you are using Make Art from a Computer Kit And you are looking at the challenge list view When you try to start challenge X by clicking on its cover photo Then a modal instructing you to "Grab your Keyboard!" appears