Improved the card view implementation.

* As per the task defined to modify the card view as bellow:
   * The entire view area of the card is clickable now, previously only description part is clickable,
   * Tags placed at the lower part of the card, previously they were above the file name
   * Video thumbnails are visible now on card view. Bug resolved in displaying video thumbnails
   * Currently Same file/resource card view is used in many places, Modified card view of pages, files, groups, themes and modules.
   * Optimized the space for showing the description part on card view 

* Also modified the query to display all file type objects according to 5 categories in Browse Resource.
"pandora_video_st " a ST of Pandora_video is defind in browse_resource.py, previously it was missing hence in browse resources other types of file objects such as interactives, documents, audios were missing.
Now all 5 categories of file types displayed properly in Browse  Resource.