[FEATURE]: Add default page size setting

[5e-Cleric]

Opened this as an upstream PR by a miss click, but shouldn't be a difference

This feature does not check for account, unlike the default save location, because it is not deemed so important.

Checks the new page style code for a page size, if a page size is already defined, it doesn't add anything. if there isn't and the default is A4, adds the A4 snippet via simple concatenation.

[5e-Cleric]

To test:

• Login in deployment using your session cookie
• Navigate to your new page, notice if the page size is changed in the style tab
• Navigate to Account Page
• Change default size to A4
• Navigate back to new page, now page size will be set to A4 and the A4 page size snippet will be inserted at the top of the CSS

[5e-Cleric]

Thinking about it, i probably should insert the snippet at the end of the CSS code, otherwise, @import won't work.