Peter Scully

This change will extract the `[PDF]` href value from the right hand side of a Google Scholar article entry. It will record the URL as `url_pdf` if the article's `url_pdf`...

#### Issue description Collecting the `official trailer video URL(s)` (e.g. ["Video Gallery" (official)](https://www.imdb.com/title/tt0317198/videogallery/?ref_=tt_pv_vi_sm)) of a movie is unclear. I assume this is a missing feature. (It might be it's missing...