feat: style book

[batonac]

It would be really useful if we could define global styling for basic HTML elements globally (and/or based on an additional "Builder Theme" abstraction layer).

I suggest that this include a pre-set collection of blocks, including, but not limited to:

• Headings (h1-h7)
• Paragraph
• Link
• Lists (ol & ul)
• Quote
• Table

Some of these needs can be covered by global components and/or custom stylesheets, but it's a bit tedious to create global components for every one of these, and style sheets don't currently load on the backend (and aren't visual).

Here's the WordPress Style Book from the Site Editor, for inspiration:

[batonac]

This should include form elements as well, especially if/when there's a native webform integration block.