R1:e5c6a5749ad2

Fix fatal in rendering Phriction "Moved Away" stories

Summary:
Ref T13202. See PHI881. These stories have bad rendering methods, but they didn't previously render into the timeilne (since Phriction documents didn't have a timeline).

Update the rendering to work.

The rendered outcome isn't great (it isn't very clear or explicit about exactly what moved where), but I'll fix that in a followup. This is a net improvement since it doesn't fatal the page, at least.

Test Plan:
- Moved page "X" to "Y".