Support bold in ANSI coloring

[applejag]

Is your feature request related to a problem? Please describe.
Want bold styling to show in the images.

Describe the solution you'd like
Just enabling simple bold styling on the text, as you have commented-out in ansi.go:

freeze/ansi.go

Lines 140 to 142 in 80803eb

	case 1:
	// span.CreateAttr("font-weight", "bold")
	p.lines[p.row].AddChild(span)

Why is that commented out?

Describe alternatives you've considered
I have tried cloning the repo, uncommenting that line, and it seems to work just fine. Not a super nice workflow though.

Additional context