[Enhancement]New Page content width preset

[henrikvoetmand]

• [x] I have written a good issue

Describe the enhancement

For applications using Kirby on larger screens - there is a request for a new larger content width preset. Between the current "Optimized" and "Full"

The current naming of these presets is not optimal - therefor, if possible, we want to change the names.

Describe the solution you'd like

• Add a new content width preset (1392px) with the name "xl"
• change the name "Optimized" to "lg"

Keep the preset "default" and "full"

The reason for keeping "default" is that we want to cummunicate that this is the preferred one to use.

Have you considered any alternatives?

Are there any additional context?

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