Dev archipelago elders' storybooks should not have checkboxes

[wjt]

Threadbare version

v0.2.2-57-g0fb336c0

Affected scene

res://scenes/dev/dev_archipelago.tscn

Description

Since #1274 the storybooks in Dev Archipelago all have these unchecked boxes. But these quests can't actually be completed. We should hide them.

If we flagged such quests as "not completable"/"is dev" then we could also change "Abandon Quest" to "Return to Dev Archipelago" in the pause screen

Checklist

• I've reviewed and agree to follow the code of conduct

XP Summary (total 225)

Subdomain	Skill	XP
Engineering: Gameplay & Systems Programming	Problem Solving	75
Engineering: Gameplay & Systems Programming	Creativity & Design Thinking	75
Engineering: Gameplay & Systems Programming	Technical Literacy	75