Support single quote attributes

[joerdav]

Brought to my attention by @c-nv-s in the HTMX discord.

It is valid HTML to have single quote attributes, to make attributes that contain double quotes easier to write, https://www.w3.org/TR/html4/intro/sgmltut.html#h-3.2.2

data-script='on click log "this uses double quotes in the attribute" end'
data-script="on click log 'this uses single quotes in the attribute' end"
data-script="on click log \"escaping does not work\" end"

[joerdav]

A workaround for this for now would be to use a go string literal:

data-script={`on click log "this uses double quotes in the attribute" end`}
data-script="on click log 'this uses single quotes in the attribute' end"