add a toggle to the web viewer to toggle between narrow and wide margins

[acepelon]

Is your feature request related to a problem? Please describe. Preference, maybe, not a problem.

Describe the solution you'd like Per https://discord.com/channels/1005079685434183743/1005079686067527702/1049230918667223050

Add a toggle to the web viewer to toggle between narrow and wide margins

Additional context I typically view long lines of text in my notes (logs) and the readable line length default is pretty narrow, making more than half of the screen width into blank space.

Thanks! ACE