Implemented the search in Data Review

**Changes in Data-Review:**
- Added search box (top-left) to search in the data review.
- Search output is shown in the data review with the pagination (depending on the no. of result resources).
- Added *URL* and method in *VIEW* for the same.
- Added keyboard shortcut for scroll till both the ends. Updated *Keyboard Shortcuts* text accordingly.
- Split up of ```<table>``` section in ```data_review.html``` to ```data_review_table.html```.

**Other changes:**
- *Shelf* part being inactive, it's commented from the ```base.html```.
- ```results_search()``` of ```search_views.py``` is modified to get the search result in the dict format.
  - Previously this method was only redirecting to ```ndf/search_page.html``` template.
  - But by adding one-more/last parameter, ```return_only_dict=True```, now we could get return result in the dict format.
  - So now, search module can be used by any other view to get the search output.
- When we go to write multi-line text in the orgitdown text editor (means the moment we hit ```Enter```), It gives an error. Which is resolved.  

**Current limitation:**
- Search in the data-review is totally depends on the output of the ```results_search()``` in ```search_views.py```.
- This module is currently showing only ```PUBLIC``` resources. So the ```PRIVATE``` resources will not be shown (which is subjected to modification in the future).
- Also the current *Data Review* is showing only ```File``` resources (very soon, it would show other type of resources). On the basis of same, the search result (for time being) is filtered to show only ```File``` resources.

**TEST :** *Above listed bullets needs to be check with the limitations.*