Use css based truncation in view instead of javascript based truncation

[jfroelich]

append-slide should be relying on css-based truncation rather than calling truncate-html. Essentially I only need to use javascript-based truncation to impose storage constraints (e.g. max content length). For the view, I can just render quickly and let the native browser do its thing. This may also turn out to be more responsive.

[jfroelich]

this also applies to options-page.js

[jfroelich]

done