Default menu links should check a real permission

[simonw]

datasette/datasette/default_menu_links.py

Lines 4 to 6 in 18a64fb

	@hookimpl
	def menu_links(datasette, actor):
	if actor and actor.get("id") == "root":

This should check a named permission so that it can be customized by permission plugins.

[simonw]

Then this can make it available to root: https://github.com/simonw/datasette/blob/18a64fbb29271ce607937110bbdb55488c43f4e0/datasette/default_permissions.py

[simonw]

Permission idea: debug-menu

[simonw]

Document the new permission here: https://docs.datasette.io/en/stable/authentication.html#built-in-permissions

[simonw]

I mainly want this so I can add that debug menu to my Dogsheep.

[simonw]

Documentation: https://docs.datasette.io/en/latest/authentication.html#debug-menu