Feature Description

I would like to suggest a page width control button as an option in hugo.yaml, which allows users to toggle different page width in the navbar in whatever page they want.

Problem/Solution

• Full width for docs content #733

• Change page width behavior below 1280px #852

Users report that some time they want to make full use of the screen space.

Alternatives Considered

Additional Context

We have implemented a similar feature in our site, I don't know if we should have this built-in as a hextra extension (if so, I would like to open a PR for this).

Preview link: https://width-control.hitsz-open-auto-github-io.pages.dev/docs/fresh-autumn/comp1011/

Initial implementation: HITSZ-OpenAuto/hoa-moe#386

P.S: as #778 has supported hide sidebar, maybe we can hide sidebar as well?