Modification regarding MIS-GAPP url's mapping and display, and Search implemented for GAPPS list-view

**Functionalities implemented:**

1) **Modification regarding MIS-GAPP url's mapping and display**

   - Files modified:
   
   1) ndf/urls/__init__.py
   2) ndf/urls/mis.py
   3) ndf/views/mis.py
   4) ndf/templates/ndf/mis.html
   
2) **Search implemented for GAPPS list-view**

   - Files modified:
   
    1) ndf/templates/ndf/node_search_base.html (Common template having serach form - included in all below templates)
    2) ndf/templates/ndf/page_list.html
    3) ndf/views/page.py
    4) ndf/templates/ndf/file.html
    5) ndf/views/file.py
    6) ndf/templates/ndf/forum.html
    7) ndf/views/forum.py
    8) ndf/templates/ndf/course.html
    9) ndf/views/course.py
   10) ndf/templates/ndf/module.html
   11) ndf/views/module.py
   
3) **Modifications to card-view elements**

   - First 3 Tags are shown
   - Name characters truncated to 20 chars
   - File's mime-type truncated to 15 chars
   - Created by user (with it's icon) is moved to next line
   - Files modified: Respective list-view templates