Wider max width layout

[reakaleek]

• Full width layout PoC
• Also set max width for other elements
• Fixes and fine-tuning
• Cleanup
• Fix isolated build header position
• Formatting
• Prettier
• Limited max width PoC

[Mpdreamz]

Approving to unblock.

A few further tweaks would be good in relation to margin and alignment.

For isolated builds the logo and name should be max-width'ed too if that makes sense.