Twitter cards should have text thumbnails

[jace]

Hasjob should render an image featuring the text of a job post (first few paragraphs) and use this for Twitter card previews. Thus will help provide some context for the post within the Twitter timeline.

[harshalbhatia]

Context: https://github.com/hasgeek/funnel/issues/186 Having dynamic, large cards would be even better in Hasjob. We could dynamically generate a big image with multiple details. This would make for a much better user experience. Not to mention, better conversion rates. Win-Win. :100: