Ability to disable "Blank page" template on page creation UI

[vmassol]

@mleduc

Imo an interesting improvement could be to provide a specific default for a space. For instance, if you have a space dedicated to documentation, define a “Documentation template” as the default for this space.

That could be interesting too indeed.

It still raises the question of being able to have several default templates. The “Blank page” would be registered for the whole wiki and thus wouldn’t be replaced. The new default template would be added next to it for some specific spaces in your example. So we’d still need the ability to disable/remove the “Blank page” one I think.