[FR] add full width pages

### Description

Currently page width can seem wasteful of space, especially when using multiple columns in page layout. Notion solved this by giving the option of creating "full width" pages, drastically increasing the horizontal usage of space.

See video for demonstration : https://www.youtube.com/watch?v=TB7lZhCk-rc&t=664s

### Impact

currently, using multiple columns in a page displays poorly, since so much of the horizontal page space is "wasted" on nothing.

### Additional Context

_No response_