Use `Editor Title` as `document.title` in the NR editor

### Description

Hi Team,

The `Editor` section in `Settings` for an instance contains the `Editor Title` configuration which becomes the following parameter in the `settings` file:

```js
module.exports = {
editorTheme: {
header: {
title: "My Editor Title"
}
}
}
```

The `editorTheme` object also contains the `page.title` property which is used by the NR editor for the `document.title`.

Would it be possible to link the `Editor Title` configuration to the `page.title` setting so that the document title matches the project name? Because currently each instance has the *FlowFuse : [FlowName or Hostname]* title.

Thank you

### Which customers would this be available to

Everyone - CE/Starter/Team/Enterprise

### Have you provided an initial effort estimate for this issue?

I am not a FlowFuse team member