Submitting a template has some holes

[rylandg]

A user highlighted the holes in the "Submitting a Template to Reshuffle" page.

I would like to see more info as to the required structure of the tempalte_init_data.json, if there is any requirements. If there aren’t, I’d like to read that there aren’t :) (i.e. is a key called “items” required, or arbitrary? etc)

The template rules should be better fleshed out, and we shouldn't force the user to manually create a init_data.json file