refactor: app settings layout

[IMB11]

• Splits up app settings like we have in the website in prep for further settings subpages
• Consistency in option layouts (header > action > subtext)
• Improved copy for some settings

[modrinth-bot]

Pull request changelog

App

Added

Changed

• Split up the App Settings modal into categories.
• Moved out behavioural settings into it's own subpage, rather than being in Appearance settings.

Deprecated

Removed

Fixed

Security

Website

Added

Changed

Deprecated

Removed

Fixed

Security

Hosting

Added

Changed

Deprecated

Removed

Fixed

Security

[modrinth-bot]

Frontend previews

Last deployed commit is f3bbd6eec99adafadbe81dbb438cb413e7b596eb

Persistent

Environment	URL
staging	https://pr-6891-staging-frontend.modrinth.workers.dev
production	https://pr-6891-frontend.modrinth.workers.dev
storybook	https://pr-6891-storybook.modrinth.workers.dev

Latest commit

Environment	URL
staging	https://git-f3bbd6ee-staging-frontend.modrinth.workers.dev
production	https://git-f3bbd6ee-frontend.modrinth.workers.dev
storybook	https://git-f3bbd6ee-storybook.modrinth.workers.dev