Upgrade to latest Keystone and update copy

[dcousens]

I don't know if I'm aligned with the idea that we should ship a default example with access: allowAll, but I digress.
I have at least removed the impression that access control might be in effect by removing the following code:

    ui: {
      // For our starter, we check that someone has session data before letting them see the Admin UI.
      isAccessAllowed: (context) => !!context.session?.data,
    },

If we're going to add an isAccessAllowed to that effect, then we should add actual access control to everything.
For now I have added the following copy to each of the mandatory access definitions:

    // WARNING
    //   for this starter project, anyone can create, query, update and delete anything
    //   if you want to prevent random people on the internet from accessing your data,
    //   you can find out more at https://keystonejs.com/docs/guides/auth-and-access-control

I might follow that up soon, but at least for now the user has plenty of warning and opportunity to learn what to change and where.

[dcousens]

Unfortunate, but we can remove it when keystonejs/keystone#8023 is resolved

[dcousens]

The default is isFilterable: true

[dcousens]

I didn't see a reason to keep this

[dcousens]

As an example of a timestamp, this seemed more appropriate compared to publishDate

[dcousens]

I think we can keep this example simple

If we introduce a status to newcomers, we should do something useful with it.
On that point, we should update the blog example to do something with the status (like hiding posts that aren't published).

[dcousens]

We shouldn't do this, someone will be burnt 🔥 by it, somewhere

[dcousens]

I guess the problem is this will force someone to login every time they update the schema

[dcousens]

I think we need to decide what this example is meant to be.

The balance at the moment is halfway between a template project (like create-react-app) and a project to learn Keystone with.
I think Keystone is too complicated to try and box up a template project and tutorial in one.